[NFC][GlobalISel] Fix case of local variable

Author: vitalybuka

llvm/include/llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h

@@ -690,9 +690,9 @@ class GIMatchTableExecutor {
   bool isObviouslySafeToFold(MachineInstr &MI, MachineInstr &IntoMI) const;
 
   template <typename Ty> static Ty readBytesAs(const uint8_t *MatchTable) {
-    Ty res;
-    memcpy(&res, MatchTable, sizeof(res));
-    return res;
+    Ty Ret;
+    memcpy(&Ret, MatchTable, sizeof(Ret));
+    return Ret;
   }
 };