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[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.8

Description

[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.8

Refine longjmp key management. For Linux, re-implement key retrieval in
C (instead of assembly). Removal of InitializeGuardPtr and a final
round of cleanups will be done in the next commit.

Reviewed By: dvyukov

Differential Revision: https://reviews.llvm.org/D64092