[PATCH] Improve diagnostics for asm immediate constraints and downgrade from error to default-error

[Saleem Abdulrasool]

I like the new diagnostic message.  I think we should get that committed (and merged for the 3.6 release).  However, Im not sure I agree with the downgrading of the error in the case of the failure to validate the constant though.


http://reviews.llvm.org/D7014

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