[AST] Check that GNU range case statements are correctly imported.

The test for case statements did not cover GNU range case statements.

Differential Revision: https://reviews.llvm.org/D53610

Reviewed By: rjmccall

llvm-svn: 345506
diff --git a/clang/test/Import/switch-stmt/Inputs/F.cpp b/clang/test/Import/switch-stmt/Inputs/F.cpp
index 66cd40f..5d0d837 100644
--- a/clang/test/Import/switch-stmt/Inputs/F.cpp
+++ b/clang/test/Import/switch-stmt/Inputs/F.cpp
@@ -3,12 +3,17 @@
   case 1:
   case 2:
     break;
+  case 3 ... 4:
+  case 5 ... 5:
+    break;
   }
   switch (int varname; 1) {
   case 1:
     break;
   case 2:
     break;
+  case 3 ... 5:
+    break;
   }
   switch (1)
   default: