[PATCH] Catch malformed inline assembly clobber constraints

[Akira Hatanaka]

The attached patch adds a check to InlineAsm::ConstraintInfo::Parse which
checks that '{' immediately follows '~' in the inline assembly clobber
constraint. This enables catching the error in the test case earlier by
LLParser and printing a more helpful diagnostic, rather than terminating
when an llvm_unreachable is triggered.

This patch fixes rdar://problem/14206559.
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