Add a FOLLY_ASAN_ENABLED macro
Summary: Add a new macro to track if folly was compiled with ASAN enabled. This is in addition to the existing FOLLY_SANITIZE_ADDRESS macro, which reports if the current .cpp file is being compiled with ASAN enabled. In particular, these macros differ in open source builds if folly was compiled without ASAN enabled, but some of its headers are being included from downstream libraries that are being built with ASAN enabled. Previously several headers would define structures differently based on `FOLLY_SANITIZE_ADDRESS`, which meant that different .cpp files would see different definitions of these structures. `FOLLY_ASAN_ENABLED` is generally the correct macro to use for situations like this. This diff fixes F14Table.h to use FOLLY_ASAN_ENABLED, but several other headers probably should also be updated in the future. I did not change the behavior of FOLLY_SANITIZE_ADDRESS, since it appears to be used by several projects outside of folly, and they expect it to report if their code is being compiled with ASAN enabled. At the moment the open source build does not support compiling with ASAN, so FOLLY_ASAN_ENABLED is always disabled in open source builds. Reviewed By: nbronson Differential Revision: D10401271 fbshipit-source-id: 7e028737b42eecae93f06538dcf76dd64bd32e6a
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