[RemoveRedundantDebugValues] Enable machine verification after this pass

[foad]

Summary

Machine verification after RemoveRedundantDebugValues has been disabled
since the pass was first added in D105279, but I guess this was just due
to copy-and-paste. Enabling it does not show any problems in check-llvm
in an LLVM_ENABLE_EXPENSIVE_CHECKS build.

[djtodoro]

Thanks!

llvm/lib/CodeGen/TargetPassConfig.cpp

void TargetPassConfig::addMachinePasses() {
   if (getOptimizeRegAlloc())
     addOptimizedRegAlloc();
   else
     addFastRegAlloc();
 
   // Run post-ra passes.
   addPostRegAlloc();
 
-  addPass(&RemoveRedundantDebugValuesID, false);
+  addPass(&RemoveRedundantDebugValuesID);
 
   addPass(&FixupStatepointCallerSavedID);
 
   // Insert prolog/epilog code.  Eliminate abstract frame index references...
   if (getOptLevel() != CodeGenOpt::None) {
     addPass(&PostRAMachineSinkingID);
     addPass(&ShrinkWrapID);
   }