[mlir] Fix crash in diagnostic verifier for unmatched @unknown expectations (#186148) When an expected-* directive uses the @unknown location specifier, the associated ExpectedDiag record has an invalid (null) SMLoc as its fileLoc. If the expected diagnostic is never produced, emitError() is called to report the unmatched expectation, but it unconditionally constructs an SMRange from fileLoc, triggering a null-pointer dereference (UBSan) and an assertion failure in SMRange's constructor which requires both endpoints to have equal validity. Fix by guarding the SMRange construction with a fileLoc.isValid() check. When fileLoc is invalid, call PrintMessage without a source range. Fixes #163343 Assisted-by: Claude Code
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