[compiler-rt][asan] Use native TLS for TSD on Windows (#222705)
GCC 16 supports native Windows TLS. Use compiler-rt's THREADLOCAL
abstraction for fake_tsd on all compilers instead of spelling the
MSVC-specific storage-class syntax directly. GCC configurations using
emulated TLS remain unsupported.
Co-authored-by: Hannes Domani <ssbssa@yahoo.de>