ahatanak added a comment.
You can create a separate patch for the changes made to lib/Headers/intrin.h
and have it reviewed before committing this patch.
Also, __dst, __x and __n should be added to the output list and "memory" to the
clobber list as majnemer pointed out. I think you can use constraint "+" to
ensure the registers are clobbered. For example:
__asm__("rep movsb" : "+D"(__dst), "+S"(__src), "+c"(__n) : : "memory");
For stos, "a"(__x) can remain an input constraint since it doesn't get modified.
https://reviews.llvm.org/D15075
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