[PATCH] Mark vastart_save_xmm_regs as changing EFLAGS

[Duncan P. N. Exon Smith]

This patch marks vastart_save_xmm_regs as changing EFLAGS.

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 turned on the MI Scheduler
for X86.

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