[Benchmark] 1.8.5版本 benchmark性能损耗严重 | performance not well in Sentinel 1.8.5 compared with 1.7.x

测试场景：在4C8G机器下跑com.alibaba.csp.sentinel.benchmark.SentinelEntryBenchmark的testSingleThreadDirectly、testSingleThreadSingleEntry
对比1.8.5和1.7.0，发现1.8.5性能损耗较严重

组长度 | 1.8.5 Baseline (QPS) | 1.8.5 With Sentinel (QPS) | 1.8.5 性能损耗 | 1.7.0 Baseline (QPS) | 1.7.0 With Sentinel (QPS) | 1.7.0 性能损耗 | 官方 Baseline (QPS) | 官方 With Sentinel (QPS) | 官方 性能损耗
-- | -- | -- | -- | -- | -- | -- | -- | -- | --
length=25 | 524112.631 | 277096.821 | 47.13% | 551245.089 | 364269.65 | 33.92% | 604589.916 | 401687.765 | 33.56%
length=50 | 205371.625 | 151465.386 | 26.25% | 213939.277 | 179810.663 | 15.95% | 221307.617 | 192407.832 | 13.06%
length=100 | 89676.053 | 78605.025 | 12.35% | 92361.784 | 85894.033 | 7.00% | 97673.228 | 91535.146 | 6.28%
length=200 | 40003.392 | 37519.764 | 6.20% | 41446.589 | 39917.156 | 3.69% | 43742.96 | 42711.129 | 2.36%
length=500 | 13942.424 | 13677.998 | 1.90% | 14563.868 | 14378.434 | 1.27% | 15332.924 | 15171.024 | 1.06%
length=1000 | 6392.317 | 6282.31 | 1.72% | 6624.78 | 6588.871 | 0.54% | 7012.848 | 6984.036 | 0.41%

Start with com.alibaba.csp.sentinel.benchmark.SentinelEntryBenchmark and run testSingleThreadDirectly and testSingleThreadSingleEntry under the reported 4C8G setup. Compare Sentinel 1.8.5 with 1.7.0 and determine which behavior causes the regression. Done means the performance loss is explained and an agreed improvement is verified against the benchmark.

Written by the indexing model from the issue text.