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from 9f1db094a [sanitizer_common] Always use posix_spawn on Darwin new 170060440 [GWP-ASan] Implement stack frame compression.

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Summary of changes: lib/gwp_asan/CMakeLists.txt | 14 ++ lib/gwp_asan/guarded_pool_allocator.cpp | 44 +++-- lib/gwp_asan/guarded_pool_allocator.h | 22 ++- lib/gwp_asan/stack_trace_compressor.cpp | 111 +++++++++++ lib/gwp_asan/stack_trace_compressor.h | 38 ++++ lib/gwp_asan/stack_trace_compressor_fuzzer.cpp | 49 +++++ lib/gwp_asan/tests/compression.cpp | 258 +++++++++++++++++++++++++ 7 files changed, 517 insertions(+), 19 deletions(-) create mode 100644 lib/gwp_asan/stack_trace_compressor.cpp create mode 100644 lib/gwp_asan/stack_trace_compressor.h create mode 100644 lib/gwp_asan/stack_trace_compressor_fuzzer.cpp create mode 100644 lib/gwp_asan/tests/compression.cpp