Fix type of VAArgOverflowSizeTLS

Author: vitalybuka

llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -5706,7 +5706,7 @@ struct VarArgPowerPCHelper : public VarArgHelperBase {
     assert(!VAArgSize && !VAArgTLSCopy &&
            "finalizeInstrumentation called twice");
     IRBuilder<> IRB(MSV.FnPrologueEnd);
-    VAArgSize = IRB.CreateLoad(MS.IntptrTy, MS.VAArgOverflowSizeTLS);
+    VAArgSize = IRB.CreateLoad(IRB.getInt64Ty(), MS.VAArgOverflowSizeTLS);
     Value *CopySize = VAArgSize;
 
     if (!VAStartInstrumentationList.empty()) {