IR: Rename replaceWithUniqued() tests from r233751

replaceWithUniquedUnresolved
replaceWithUniquedUnresolvedChangedOperand
 =>
replaceWithUniquedResolvingOperand
replaceWithUniquedChangingOperand

I find the new names less confusing; they're also more accurate.  Sorry
for the churn.

llvm-svn: 233759
diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index 270349e..ac8a256 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -627,7 +627,7 @@
   }
 }
 
-TEST_F(MDNodeTest, replaceWithUniquedUnresolved) {
+TEST_F(MDNodeTest, replaceWithUniquedResolvingOperand) {
   // temp !{}
   MDTuple *Op = MDTuple::getTemporary(Context, None).release();
   EXPECT_FALSE(Op->isResolved());
@@ -647,7 +647,7 @@
   EXPECT_TRUE(N->isResolved());
 }
 
-TEST_F(MDNodeTest, replaceWithUniquedUnresolvedChangedOperand) {
+TEST_F(MDNodeTest, replaceWithUniquedChangingOperand) {
   // i1* @GV
   Type *Ty = Type::getInt1PtrTy(Context);
   std::unique_ptr<GlobalVariable> GV(