Change Regex Cache to use a System.Threading.Lock instance directly

[jkoritzinsky]

Use a System.Threading.Lock instance directly instead of going through the syncblock on the ConcurrentDictionary.

[jkoritzinsky]

@MihuBot benchmark System.Text.RegularExpressions.Tests.Perf_Regex_Cache

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[MihaZupan]

MihuBot/runtime-utils#1711

System.Text.RegularExpressions.Tests.Perf_Regex_Cache

BenchmarkDotNet v0.14.1-nightly.20250107.205, Linux Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 9V74, 1 CPU, 8 logical and 4 physical cores
LongRun : .NET 11.0.0 (42.42.42.42424), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
Job=LongRun  OutlierMode=DontRemove  IterationCount=100
LaunchCount=3  MemoryRandomization=True  WarmupCount=15

Method	Toolchain	total	unique	cacheSize	Mean	Error	Ratio	Allocated	Alloc Ratio
IsMatch	Main	40000	7	0	25.653 ms	0.1454 ms	1.00	96960012 B	1.00
IsMatch	PR	40000	7	0	25.135 ms	0.1054 ms	0.98	96960012 B	1.00
IsMatch	Main	40000	1600	15	62.878 ms	0.1261 ms	1.00	154806351 B	1.00
IsMatch	PR	40000	1600	15	63.127 ms	0.1273 ms	1.00	154806351 B	1.00
IsMatch	Main	40000	1600	800	45.539 ms	0.1484 ms	1.00	80778953 B	1.00
IsMatch	PR	40000	1600	800	45.711 ms	0.1209 ms	1.00	80811257 B	1.00
IsMatch	Main	40000	1600	3200	7.397 ms	0.0159 ms	1.00	49960 B	1.00
IsMatch	PR	40000	1600	3200	7.492 ms	0.0271 ms	1.01	49960 B	1.00
IsMatch	Main	400000	1	15	23.476 ms	0.3509 ms	1.01	84 B	1.00
IsMatch	PR	400000	1	15	22.685 ms	0.0600 ms	0.97	84 B	1.00
IsMatch	Main	400000	7	15	27.475 ms	0.0599 ms	1.00	564 B	1.00
IsMatch	PR	400000	7	15	27.929 ms	0.1273 ms	1.02	572 B	1.01
IsMatch_Multithreading	Main	40000	7	0	8.232 ms	0.0500 ms	1.00	96961149 B	1.00
IsMatch_Multithreading	PR	40000	7	0	7.953 ms	0.0543 ms	0.97	96961140 B	1.00
IsMatch_Multithreading	Main	40000	1600	15	22.587 ms	0.2458 ms	1.00	154807707 B	1.00
IsMatch_Multithreading	PR	40000	1600	15	22.258 ms	0.0890 ms	0.99	154775173 B	1.00
IsMatch_Multithreading	Main	40000	1600	800	20.011 ms	0.0528 ms	1.00	80012774 B	1.00
IsMatch_Multithreading	PR	40000	1600	800	20.199 ms	0.0579 ms	1.01	80020453 B	1.00
IsMatch_Multithreading	Main	40000	1600	3200	2.616 ms	0.0138 ms	1.00	81081 B	1.00
IsMatch_Multithreading	PR	40000	1600	3200	2.595 ms	0.0066 ms	0.99	81071 B	1.00
IsMatch_Multithreading	Main	400000	1	15	11.337 ms	0.0664 ms	1.00	1062090 B	1.00
IsMatch_Multithreading	PR	400000	1	15	11.622 ms	0.0991 ms	1.03	1924845 B	1.81
IsMatch_Multithreading	Main	400000	7	15	24.517 ms	0.0552 ms	1.00	66529120 B	1.00
IsMatch_Multithreading	PR	400000	7	15	24.260 ms	0.0489 ms	0.99	68080240 B	1.02