Debug Info: improve the Finder.

Improve the Finder to handle context of a DIVariable used by DbgValueInst.
Fix testing cases to make them pass the verifier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187052 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/DebugInfo.cpp

@@ -948,6 +948,7 @@ void DebugInfoFinder::processValue(const DbgValueInst *DVI) {
 
   if (!NodesSeen.insert(DV))
     return;
+  processScope(DIVariable(N).getContext());
   processType(DIVariable(N).getType());
 }