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Commit d68c7aa7 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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Stop crashing on empty asm input constraints 

An empty string for an ASM input constraint is invalid, and will crash
during clang CodeGen.  Change TargetInfo::validateInputConstraint to
reject an empty string.

<rdar://problem/15552191>

llvm-svn: 197362
parent 774cabb5
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