[PATCH] Error out on inline-asm constraint "=f"

[Akira Hatanaka]

This patch changes X86TargetInfo::validateAsmConstraint to check whether
constraint "f" is used for output operands and error-out if it is. The
following link explains why "=f" is disallowed.

https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html
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