Simplify PoolAlloc by using thread_local
#3267
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glslang is using C++ 11, which has first class support for variables of the `thread_local` storage class. By dropping the use of the `OS_[GS]etTLSValue`, we can simplify the logic, and have it support a thread-local default allocator if none is provided. Issue: KhronosGroup#2346
These were only used for TThreadPool, which now uses `thread_local`.
These are no longer used now that the PoolAllocator uses the standard c++11 thread_local storage mechanism.
arcady-lunarg
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kokoro:run
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This is largely a revert of the revert of #2348, which was reverted due to not working on iOS 8.
C++11 supports thread_local storage class, which means we can drop the use of OS-bespoke OS_*TLSIndex functions.
This greatly simplifies fixing #2346.
Fixes #1429