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[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.4

Authored by yln on Jul 5 2019, 11:00 AM.

Description

[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.4

For x86_64, since we don't clobber %rsi (2nd argument) anymore, we don't
have to save/restore it.

Reviewed By: dvyukov

Differential Revision: https://reviews.llvm.org/D63946

llvm-svn: 365229