Unable to replicate RPi0 tests

I am trying to verify the test results of the Raspberry Pi Zero W as listed in the table under the [Raspberry Pi section](https://github.com/google/XNNPACK#raspberry-pi) in the [README.md](https://github.com/google/XNNPACK/blob/master/README.md). However I am unable to get sane (or same) results:

```
samveen@facez:~/XNNPACK/build/local $ time ./end2end-bench --benchmark_min_time=5
Error in cpuinfo: failed to parse file /sys/devices/system/cpu/kernel_max: "-1
" is not an unsigned number
2023-04-22T02:17:08+01:00
Running ./end2end-bench
Run on (1 X 1000 MHz CPU )
Load Average: 0.99, 1.00, 1.00
***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
-----------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations UserCounters...
-----------------------------------------------------------------------------------------------------
FP32MobileNetV1/T:1/real_time 3952697 us 3950282 us 2 cpufreq=1000M
FP32MobileNetV2/T:1/real_time 2014865 us 2009419 us 3 cpufreq=1000M
^\Quit

real 163m3.618s
user 162m56.411s
sys 0m0.407s
```

As can be seen from the above, the test for `FP32 MobileNet v3 Large` does bit complete in the expected timeframe (i.e. less than the time take for `FP32 MobileNet v2 1.0X`), but instead doesn't complete (maximum time before my patience ran out was a 16 hour overnight run).
I ran `strace` on the binary in verbose mode with `sudo strace ./build/local/end2end-bench --benchmark_min_time=5 --v=1000`. The last relevant bit of output is as follows:

```
brk(0x2197d000) = 0x2197d000
write(2, "-- LOG(", 7-- LOG() = 7
write(2, "2", 12) = 1
write(2, "): ", 3): ) = 3
write(2, "Ran in ", 7Ran in ) = 7
write(2, "6.01356", 76.01356) = 7
write(2, "/", 1/) = 1
write(2, "6.02472", 76.02472) = 7
write(2, "\n", 1
) = 1
write(1, "\33[0;32mFP32MobileNetV2/T:1/real_"..., 133FP32MobileNetV2/T:1/real_time 2008239 us 2004521 us 3 cpufreq=1000M
) = 133
write(1, "\33[m", 3) = 3
write(2, "-- LOG(", 7-- LOG() = 7
write(2, "2", 12) = 1
write(2, "): ", 3): ) = 3
write(2, "Running ", 8Running ) = 8
write(2, "FP32MobileNetV3Large/T:1/real_ti"..., 34FP32MobileNetV3Large/T:1/real_time) = 34
write(2, " for ", 5 for ) = 5
write(2, "1", 11) = 1
write(2, "\n", 1
) = 1
openat(AT_FDCWD, "/dev/urandom", O_RDONLY) = 3
read(3, "\271\0364N", 4) = 4
futex(0x1fe5c0d8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
```

Then nothing after (no system calls of any sort). Even the quit signal doesn't prompt anything:
```
futex(0x1fe5c0d8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
^\strace: Process 958 detached
Quit
```

However `top` shows that `end2end-bench` is consuming all the compute resources on the RPi0 (18 hours into the run):
```
top - 06:10:47 up 1 day, 26 min, 2 users, load average: 1.08, 1.02, 1.01
Tasks: 87 total, 2 running, 85 sleeping, 0 stopped, 0 zombie
%Cpu(s): 99.0 us, 1.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 476.9 total, 112.0 free, 155.6 used, 209.3 buff/cache
MiB Swap: 1000.0 total, 986.7 free, 13.2 used. 265.4 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19235 root 20 0 527284 131436 3548 R 98.7 26.9 1101:41 end2end-bench
21863 samveen 20 0 11096 2984 2496 R 1.0 0.6 0:00.10 top
```

My build was created using `scripts/build-local.sh` (as per the Raspberry Pi section) using the following parameters:
```bash -x ./scripts/build-local.sh -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -DXNNPACK_ENABLE_ARM_DOTPROD:BOOL=OFF```

The parameter ```XNNPACK_ENABLE_ARM_DOTPROD:BOOL=OFF``` is required for local builds on the Raspberry Pi Zero due to Neon specific SIMD assembly contained in the sources in the folders `src/qc8-igemm/` and `src/qc8-gemm/`, which the native armv6 assembler doesn't support:
```
[ 69%] Building C object CMakeFiles/microkernels-all.dir/src/qc8-gemm/gen/qc8-gemm-1x8c4-minmax-fp32-neondot.c.o
/usr/bin/cc -DFXDIV_USE_INLINE_ASSEMBLY=0 -DPTHREADPOOL_NO_DEPRECATED_API=1 -DXNN_ENABLE_ARM_BF16=1 -DXNN_ENABLE_ARM_DOTPROD=1 -DXNN_ENABLE_ARM_FP16_SCALAR=1 -DXNN_ENABLE_ARM_FP16_VECTOR=1 -DXNN_ENABLE_ASSEMBLY=1 -DXNN_ENABLE_DWCONV_MULTIPASS=0 -DXNN_ENABLE_GEMM_M_SPECIALIZATION=1 -DXNN_ENABLE_JIT=0 -DXNN_ENABLE_MEMOPT=1 -DXNN_ENABLE_RISCV_VECTOR=1 -DXNN_ENABLE_SPARSE=1 -I/home/samveen/XNNPACK/src -I/home/samveen/XNNPACK/build/local/pthreadpool-source/include -I/home/samveen/XNNPACK/build/local/FXdiv-source/include -I/home/samveen/XNNPACK/build/local/FP16-source/include -O3 -DNDEBUG -fPIC -Wno-psabi -O2 -pthread -std=c99 -fno-math-errno -marm -march=armv8.2-a+dotprod -mfpu=neon-fp-armv8 -o CMakeFiles/microkernels-all.dir/src/qc8-gemm/gen/qc8-gemm-1x8c4-minmax-fp32-neondot.c.o -c /home/samveen/XNNPACK/src/qc8-gemm/gen/qc8-gemm-1x8c4-minmax-fp32-neondot.c
/tmp/ccEN2Cuz.s: Assembler messages:
/tmp/ccEN2Cuz.s:62: Error: selected processor does not support `vsdot.s8 q8,q11,d7[0]' in ARM mode
/tmp/ccEN2Cuz.s:64: Error: selected processor does not support `vsdot.s8 q10,q9,d7[0]' in ARM mode
/tmp/ccEN2Cuz.s:67: Error: selected processor does not support `vsdot.s8 q8,q9,d7[1]' in ARM mode
/tmp/ccEN2Cuz.s:71: Error: selected processor does not support `vsdot.s8 q10,q9,d7[1]' in ARM mode
/tmp/ccEN2Cuz.s:143: Error: selected processor does not support `vsdot.s8 q10,q9,d7[0]' in ARM mode
/tmp/ccEN2Cuz.s:146: Error: selected processor does not support `vsdot.s8 q8,q11,d7[0]' in ARM mode
gmake[2]: *** [CMakeFiles/microkernels-all.dir/build.make:44129: CMakeFiles/microkernels-all.dir/src/qc8-gemm/gen/qc8-gemm-1x8c4-minmax-fp32-neondot.c.o] Error 1
gmake[2]: Leaving directory '/home/samveen/XNNPACK/build/local'
gmake[1]: *** [CMakeFiles/Makefile2:12284: CMakeFiles/microkernels-all.dir/all] Error 2
gmake[1]: Leaving directory '/home/samveen/XNNPACK/build/local'
gmake: *** [Makefile:163: all] Error 2
```

The environment is as below:
```
samveen@facez:~ $ date --utc
Sat 22 Apr 04:56:02 UTC 2023
samveen@facez:~ $ grep NAME /etc/os-release; echo; uname -a; echo; cat /proc/cpuinfo|grep -iv serial; echo; vcgencmd get_mem arm; vcgencmd get_mem gpu; echo; free -h; echo; df -h /; echo; sudo apt update && sudo apt upgrade
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_CODENAME=bullseye

Linux facez.cluster.samveen.in 6.1.21+ #1642 Mon Apr 3 17:19:14 BST 2023 armv6l GNU/Linux

processor : 0
model name : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 997.08
Features : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xb76
CPU revision : 7

Hardware : BCM2835
Revision : 9000c1
Model : Raspberry Pi Zero W Rev 1.1

arm=496M
gpu=16M

total used free shared buff/cache available
Mem: 476Mi 44Mi 205Mi 0.0Ki 227Mi 382Mi
Swap: 999Mi 0B 999Mi

Filesystem Size Used Avail Use% Mounted on
/dev/root 15G 13G 1.4G 90% /

Get:1 http://mirror.ossplanet.net/raspbian/raspbian bullseye InRelease [15.0 kB]
Hit:2 http://archive.raspberrypi.org/debian bullseye InRelease
Fetched 15.0 kB in 3s (5,019 B/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```