Fix some of the strange CBE-only failures that happened last night.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12980 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -386,6 +386,7 @@ void IndVarSimplify::runOnLoop(Loop *L) {
 
   // Now that we know the largest of of the induction variables in this loop,
   // insert a canonical induction variable of the largest size.
+  LargestType = LargestType->getUnsignedVersion();
   Value *IndVar = Rewriter.GetOrInsertCanonicalInductionVariable(L,LargestType);
   ++NumInserted;
   Changed = true;