Merging r197503, r197505, r197520:

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r197520 | dexonsmith | 2013-12-17 12:28:21 -0800 (Tue, 17 Dec 2013) | 7
lines

Assert that the last operand is actually EFLAGS

This is another follow-up to r197503, after a post-commit review by
Andy.

<rdar://problem/15627766>

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r197505 | dexonsmith | 2013-12-17 08:20:37 -0800 (Tue, 17 Dec 2013) | 6
lines

Setting the CPU in the new vaargs test

Trying to fix buildbots after r197503 (test passes locally).

<rdar://problem/15627766>

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r197503 | dexonsmith | 2013-12-17 07:54:45 -0800 (Tue, 17 Dec 2013) | 17
lines

Revert "Revert "Mark vastart_save_xmm_regs as changing EFLAGS""

This reverts commit r197481, recommiting r197469 with an extra fix.

The vastart_save_xmm_regs pseudo-instruction expands to a test and a
branch, so it modifies EFLAGS.  Mark it so, or else the scheduler might
place it in the middle of another test+branch.

This fixes a bug exposed by r192750, which changed the initial scheduler
to source-order as part of enabling the MI Scheduler for X86.

This re-commit changes the VASTART_SAVE_XMM_REGS custom inserter not to
try to save %flags, and adds a test that catches the bad behavior of
r197469.

<rdar://problem/15627766>

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@202060 91177308-0d34-0410-b5e6-96231b3b80d8