Benchmark paniced with go1.14

**What is the issue you are having?**

Benchmark paniced with go1.14 in centos7.

**What is BigCache doing that it shouldn't?**

Should not panic when allocating memory.

**Minimal, Complete, and Verifiable Example**

```
bigcache git:(master) go test -bench=. -benchmem -benchtime=4s ./... -timeout 30m
2020/03/13 02:08:26 Allocated new queue in 1.202335ms; Capacity: 585000
2020/03/13 02:08:26 Allocated new queue in 320.745µs; Capacity: 1170000
2020/03/13 02:08:26 Allocated new queue in 296ns; Capacity: 94
goos: linux
goarch: amd64
pkg: github.com/allegro/bigcache/v2
BenchmarkWriteToCacheWith1Shard-4 4106458 1520 ns/op 608 B/op 3 allocs/op
BenchmarkWriteToLimitedCacheWithSmallInitSizeAnd1Shard-4 6213543 909 ns/op 41 B/op 3 allocs/op
BenchmarkWriteToUnlimitedCacheWithSmallInitSizeAnd1Shard-4 fatal error: runtime: out of memory

runtime stack:
runtime.throw(0x564930, 0x16)
/home/centos/go/src/runtime/panic.go:1112 +0x72
runtime.sysMap(0xc1cc000000, 0xc8000000, 0x6a2598)
/home/centos/go/src/runtime/mem_linux.go:169 +0xc5
runtime.(*mheap).sysAlloc(0x68d5c0, 0xc8000000, 0x68d5c8, 0x64000)
/home/centos/go/src/runtime/malloc.go:715 +0x1cd
runtime.(*mheap).grow(0x68d5c0, 0x64000, 0x0)
/home/centos/go/src/runtime/mheap.go:1286 +0x11c
runtime.(*mheap).allocSpan(0x68d5c0, 0x64000, 0xc000030100, 0x6a25a8, 0x200)
/home/centos/go/src/runtime/mheap.go:1124 +0x6a0
runtime.(*mheap).alloc.func1()
/home/centos/go/src/runtime/mheap.go:871 +0x64
runtime.(*mheap).alloc(0x68d5c0, 0x64000, 0x450101, 0x68d5c0)
/home/centos/go/src/runtime/mheap.go:865 +0x81
runtime.largeAlloc(0xc8000000, 0x101, 0xc085ab0b38)
/home/centos/go/src/runtime/malloc.go:1152 +0x92
runtime.mallocgc.func1()
/home/centos/go/src/runtime/malloc.go:1047 +0x46
runtime.systemstack(0x0)
/home/centos/go/src/runtime/asm_amd64.s:370 +0x66
runtime.mstart()
/home/centos/go/src/runtime/proc.go:1041

goroutine 222 [running]:
runtime.systemstack_switch()
/home/centos/go/src/runtime/asm_amd64.s:330 fp=0xc085ab0ad8 sp=0xc085ab0ad0 pc=0x461830
runtime.mallocgc(0xc8000000, 0x52c520, 0x70c4d01, 0xd6987420e770)
/home/centos/go/src/runtime/malloc.go:1046 +0x895 fp=0xc085ab0b78 sp=0xc085ab0ad8 pc=0x40c1b5
runtime.makeslice(0x52c520, 0xc8000000, 0xc8000000, 0xc085ab0c00)
/home/centos/go/src/runtime/slice.go:49 +0x6c fp=0xc085ab0ba8 sp=0xc085ab0b78 pc=0x44934c
github.com/allegro/bigcache/v2/queue.(*BytesQueue).allocateAdditionalMemory(0xc000060008, 0x421)
/home/centos/gopath/src/github.com/allegro/bigcache/queue/bytes_queue.go:103 +0xbd fp=0xc085ab0c38 sp=0xc085ab0ba8 pc=0x50165d
github.com/allegro/bigcache/v2/queue.(*BytesQueue).Push(0xc000060008, 0xc0000c2480, 0x41d, 0x41d, 0xc0000ca400, 0x400, 0x400)
/home/centos/gopath/src/github.com/allegro/bigcache/queue/bytes_queue.go:81 +0xda fp=0xc085ab0c78 sp=0xc085ab0c38 pc=0x50151a
github.com/allegro/bigcache/v2.(*cacheShard).set(0xc000060000, 0xc051d49b10, 0xb, 0x84b5b6a195780c0b, 0xc0000ca400, 0x400, 0x400, 0xc051d49b10, 0xc00009c0d0)
/home/centos/gopath/src/github.com/allegro/bigcache/shard.go:140 +0x1b2 fp=0xc085ab0d28 sp=0xc085ab0c78 pc=0x507192
github.com/allegro/bigcache/v2.(*BigCache).Set(0xc01432e0d0, 0xc051d49b10, 0xb, 0xc0000ca400, 0x400, 0x400, 0xb, 0x0)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:134 +0xac fp=0xc085ab0d80 sp=0xc085ab0d28 pc=0x503d7c
github.com/allegro/bigcache/v2.BenchmarkWriteToUnlimitedCacheWithSmallInitSizeAnd1Shard(0xc083a7c1c0)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache_bench_test.go:44 +0x1f4 fp=0xc085ab0ee8 sp=0xc085ab0d80 pc=0x509854
testing.(*B).runN(0xc083a7c1c0, 0x19f652)
/home/centos/go/src/testing/benchmark.go:191 +0xe8 fp=0xc085ab0f58 sp=0xc085ab0ee8 pc=0x4bcdc8
testing.(*B).launch(0xc083a7c1c0)
/home/centos/go/src/testing/benchmark.go:321 +0xea fp=0xc085ab0fd8 sp=0xc085ab0f58 pc=0x4bd45a
runtime.goexit()
/home/centos/go/src/runtime/asm_amd64.s:1373 +0x1 fp=0xc085ab0fe0 sp=0xc085ab0fd8 pc=0x4637c1
created by testing.(*B).doBench
/home/centos/go/src/testing/benchmark.go:276 +0x55

goroutine 1 [chan receive]:
testing.(*B).doBench(0xc083a7c1c0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/centos/go/src/testing/benchmark.go:277 +0x73
testing.(*benchContext).processBench(0xc03477ec00, 0xc083a7c1c0)
/home/centos/go/src/testing/benchmark.go:568 +0x207
testing.(*B).run(0xc083a7c1c0)
/home/centos/go/src/testing/benchmark.go:268 +0x63
testing.(*B).Run(0xc083a7c000, 0x56a5b9, 0x38, 0x56b1b0, 0x4bca00)
/home/centos/go/src/testing/benchmark.go:652 +0x3fd
testing.runBenchmarks.func1(0xc083a7c000)
/home/centos/go/src/testing/benchmark.go:533 +0x78
testing.(*B).runN(0xc083a7c000, 0x1)
/home/centos/go/src/testing/benchmark.go:191 +0xe8
testing.runBenchmarks(0x56675f, 0x1e, 0xc03477ebe0, 0x672ee0, 0xb, 0xb, 0xc0000a4e01)
/home/centos/go/src/testing/benchmark.go:539 +0x390
testing.(*M).Run(0xc0000d4000, 0x0)
/home/centos/go/src/testing/testing.go:1206 +0x42d
main.main()
_testmain.go:152 +0x135

goroutine 154 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x4, 0x3b9aca00, 0x3b9aca00, 0x1, 0x100, 0x0, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 180 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x0, 0x3b9aca00, 0x927c0, 0x1f4, 0x101, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 198 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x8bb2c97000, 0x3b9aca00, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 200 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x8bb2c97000, 0x45d964b800, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x2000, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 194 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x1, 0x12a05f200, 0x45d964b800, 0x1, 0x1, 0x100, 0x58fc40, 0x69fec0, 0x1, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 193 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x3b9aca00, 0x3b9aca00, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 153 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x12a05f200, 0x3b9aca00, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 15 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0xdf8475800, 0x3b9aca00, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 195 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x1, 0x12a05f200, 0x3b9aca00, 0x927c0, 0x1f4, 0x101, 0x58fc40, 0x69fec0, 0x1, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f

goroutine 196 [select]:
github.com/allegro/bigcache/v2.newBigCache.func1(0x400, 0x12a05f200, 0x3b9aca00, 0x927c0, 0x1f4, 0x100, 0x58fc40, 0x69fec0, 0x0, 0x0, ...)
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:91 +0x131
created by github.com/allegro/bigcache/v2.newBigCache
/home/centos/gopath/src/github.com/allegro/bigcache/bigcache.go:87 +0x46f
exit status 2
FAIL github.com/allegro/bigcache/v2 24.119s
PASS
ok github.com/allegro/bigcache/v2/queue 0.007s
2020/03/13 02:08:49 Entry not found
2020/03/13 02:08:49 stored "testkey" in cache.
2020/03/13 02:08:49 empty request.
2020/03/13 02:08:49 test read error
2020/03/13 02:08:49 not found.
2020/03/13 02:08:49 empty request.
2020/03/13 02:08:49 stored "putKey" in cache.
2020/03/13 02:08:49 invalidDeleteKey not found.
2020/03/13 02:08:49 Entry not found
2020/03/13 02:08:49 entry is bigger than max shard size
PASS
ok github.com/allegro/bigcache/v2/server 0.130s
FAIL
```

**Environment:**
- Version (git sha or release): commit 75a65a80ae5a9c8c95250b72f8ade981e37ec09f
- OS (e.g. from `/etc/os-release` or winver.exe):
```
➜ bigcache git:(master) cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
```
- go version: go version go1.14 linux/amd64