[tsan] Add tsan support for loongarch64

This patch enabled tsan for loongarch64 with 47-bit VMA layout. All
tests are passing.

Also adds assembly routines to enable setjmp/longjmp for loongarch64
on linux.

Reviewed By: dvyukov, SixWeining, #sanitizers

Differential Revision: https://reviews.llvm.org/D138489