[opaque pointer type] Use GlobalVariable::getValueType rather than accessing it through the GV's pointee type

llvm-svn: 237311
diff --git a/llvm/lib/IR/ConstantFold.cpp b/llvm/lib/IR/ConstantFold.cpp
index ec3414d..16b113d 100644
--- a/llvm/lib/IR/ConstantFold.cpp
+++ b/llvm/lib/IR/ConstantFold.cpp
@@ -1385,7 +1385,7 @@
     if (GV->hasExternalWeakLinkage() || GV->hasWeakAnyLinkage())
       return true;
     if (const auto *GVar = dyn_cast<GlobalVariable>(GV)) {
-      Type *Ty = GVar->getType()->getPointerElementType();
+      Type *Ty = GVar->getValueType();
       // A global with opaque type might end up being zero sized.
       if (!Ty->isSized())
         return true;