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[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.3

Authored by yln on Jul 1 2019, 4:23 PM.

Description

[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.3

Remove unnecessary computation of mangled SP for x86_64 architecture.

Reviewed By: dvyukov

Differential Revision: https://reviews.llvm.org/D63944

llvm-svn: 364874