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cbbae7f41d
follows '~' in a clobber constraint string. Previously llc would hit an llvm_unreachable when compiling an inline-asm instruction with malformed constraint string "~x{21}". This commit enables LLParser to catch the error earlier and print a more helpful diagnostic. rdar://problem/14206559 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217288 91177308-0d34-0410-b5e6-96231b3b80d8