[PATCH] Use SizeClassAllocator32 as an internal allocator

[Alexey Samsonov]

Hi kcc, dvyukov,

This change make InternalAlloc/InternalFree functions use SizeClassAllocator32
instead of libc malloc. It also adds thread-local caches for internal allocator
to TSan.

http://llvm-reviews.chandlerc.com/D874

Files:
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_libc.cc
  lib/sanitizer_common/sanitizer_allocator_internal.h
  lib/sanitizer_common/sanitizer_allocator.cc
  lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
  lib/sanitizer_common/tests/sanitizer_allocator_test.cc
  lib/tsan/rtl/tsan_mman.cc
  lib/tsan/rtl/tsan_rtl.h
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