C1X: implement generic selections

As an extension, generic selection support has been added for all
supported languages.  The syntax is the same as for C1X.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129554 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Core/BugReporter.cpp b/lib/StaticAnalyzer/Core/BugReporter.cpp
index 74cd359..26a89c3 100644
--- a/lib/StaticAnalyzer/Core/BugReporter.cpp
+++ b/lib/StaticAnalyzer/Core/BugReporter.cpp
@@ -859,7 +859,8 @@
           default:
             break;
           case Stmt::ParenExprClass:
-            S = cast<ParenExpr>(S)->IgnoreParens();
+          case Stmt::GenericSelectionExprClass:
+            S = cast<Expr>(S)->IgnoreParens();
             firstCharOnly = true;
             continue;
           case Stmt::BinaryConditionalOperatorClass: