[GlobalISel][Legalizer] LegalizerInfo verifier: Making LegalizerInfo::verify(...) errors fatal

Reviewers: aemerson, qcolombet

Reviewed By: qcolombet

Differential Revision: https://reviews.llvm.org/D46339

llvm-svn: 333619

lib/CodeGen/GlobalISel/LegalizerInfo.cpp

@@ -564,6 +564,9 @@ void LegalizerInfo::verify(const MCInstrInfo &MII) const {
     for (unsigned Opcode : FailedOpcodes)
       errs() << " " << MII.getName(Opcode);
     errs() << "\n";
+
+    report_fatal_error("ill-defined LegalizerInfo"
+                       ", try -debug-only=legalizer-info for details");
   }
 #endif
 }