tsan: avoid extra call indirection in unaligned access functions

Currently unaligned access functions are defined in tsan_interface.cpp
and do a real call to MemoryAccess. This means we have a real call
and no read/write constant propagation.

Unaligned memory access can be quite hot for some programs
(observed on some compression algorithms with ~90% of unaligned accesses).

Move them to tsan_interface_inl.h to avoid the additional call
and enable constant propagation.
Also reorder the actual store and memory access handling for
__sanitizer_unaligned_store callbacks to enable tail calling
in MemoryAccess.

Depends on D107282.

Reviewed By: vitalybuka, melver

Differential Revision: https://reviews.llvm.org/D107283