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[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.7

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[TSan] Improve handling of stack pointer mangling in {set,long}jmp, pt.7

Factor out ExtractLongJmpSp helper function and move platform-specific
code to tsan_platform_{linux,mac}.cc.

Reviewed By: dvyukov

Differential Revision: https://reviews.llvm.org/D64050

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