Fix for PR20402 in -Wconsumed.

https://llvm.org/bugs/show_bug.cgi?id=20402
Patch by Chris Wailes.

llvm-svn: 235051

clang/lib/Analysis/Consumed.cpp

@@ -1442,7 +1442,7 @@ void ConsumedAnalyzer::run(AnalysisDeclContext &AC) {
                                                            CurrStates,
                                                            WarningsHandler);
             
-            if (BlockInfo.allBackEdgesVisited(*SI, CurrBlock))
+            if (BlockInfo.allBackEdgesVisited(CurrBlock, *SI))
               BlockInfo.discardInfo(*SI);
           } else {
             BlockInfo.addInfo(*SI, CurrStates, OwnershipTaken);

clang/test/SemaCXX/warn-consumed-analysis.cpp

@@ -638,6 +638,18 @@ void testWhileLoop1() {
   *var0; // expected-warning {{invalid invocation of method 'operator*' on object 'var0' while it is in the 'consumed' state}}
 }
 
+// Tests if state information is correctly discarded for certain shapes of CFGs.
+void testSwitchGOTO(void) {
+	int a;
+
+	LABEL0:
+	switch (a)
+	case 0:
+		goto LABEL0;
+
+	goto LABEL0;
+}
+
 typedef const int*& IntegerPointerReference;
 void testIsRValueRefishAndCanonicalType(IntegerPointerReference a) {}