Merging r267634:

Merging r267634:
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r267634 | qcolombet | 2016-04-26 16:44:14 -0700 (Tue, 26 Apr 2016) | 11 lines

[X86] Make sure it is safe to clobber EFLAGS, if need be, when choosing
the prologue.

Do not use basic blocks that have EFLAGS live-in as prologue if we need
to realign the stack. Realigning the stack uses AND instruction and this
clobbers EFLAGS.

An other alternative would have been to save and restore EFLAGS around
the stack realignment code, but this is likely inefficient.

Fixes PR27531.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_38@268132 91177308-0d34-0410-b5e6-96231b3b80d8