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[Driver][X86] Add -malign-branch* and -mbranches-within-32B-boundaries

Authored by MaskRay on Jan 9 2020, 12:41 AM.

Description

[Driver][X86] Add -malign-branch* and -mbranches-within-32B-boundaries

These driver options perform some checking and delegate to MC options -x86-align-branch* and -x86-branches-within-32B-boundaries.

Reviewed By: skan

Differential Revision: https://reviews.llvm.org/D72463