Simplify PoolAlloc by using thread_local
#2348
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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`.
ben-clayton
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C++11 supports
thread_localstorage class, which means we can drop the use of OS-bespokeOS_*TLSIndexfunctions.This greatly simplifies fixing #2346.
Note:
thread_localwas not properly supported in Visual Studio 2013, so I've had to bump appveyor to use Visual Studio 2015.Visual Studio 2013 is scheduled to be deprecated on July 20th 2020, so this should probably not land until then.