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Fix perf problems found in investigation of issue #107728 - `CheckRun…
…ClassInitThrowing` didn't check to see if the class had been initialized before taking a lock - `EnsureTlsIndexAllocated` didn't check if the Tls index had been allocated before setting the flag via an expensive Interlocked call to indicate that it had been allocated - And finally `JIT_GetNonGCThreadStaticBaseOptimized` and `JIT_GetGCThreadStaticBaseOptimized` were missing the fast paths which avoided even calling those apis at all. (#107817) Perf with a small benchmark which does complex multithreaded work... | Runtime | Time | | ---- | ---- | | .NET 8 | 00.9414682 s | | .NET 9 before this fix | 22.8079382 | | .NET 9 with this fix | 00.2004539 | Fixes #107728 Co-authored-by: David Wrighton <davidwr@microsoft.com>
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