[PATCH] D90195: [GWP-ASan] Abstract the thread local variables access

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad created this revision.
cryptoad added reviewers: hctim, eugenis, mcgrathr.
Herald added a project: Sanitizers.
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cryptoad requested review of this revision.

In a similar fashion to D87420 <https://reviews.llvm.org/D87420> for Scudo, this CL introduces a way to
get thread local variables via a platform-specific reserved TLS slot,
since Fuchsia doesn't support ELF TLS from the libc itself.

If needing to use this, a platform will have to define
`GWP_ASAN_HAS_PLATFORM_TLS_SLOT` and provide `gwp_asan_platform_tls_slot.h`
which will define a `uint64_t *getPlatformGwpAsanTlsSlot()` function
that will return the TLS word of storage.

I snuck in a couple of cleanup items as well, moving some static
functions to anonymous namespace for consistency.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D90195

Files:
  compiler-rt/lib/gwp_asan/guarded_pool_allocator.cpp
  compiler-rt/lib/gwp_asan/guarded_pool_allocator.h
  compiler-rt/lib/gwp_asan/platform_specific/guarded_pool_allocator_posix.cpp

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