Introduce a non-uglified syntax for module imports in Objective-C:

  @import identifier [. identifier]* ;

llvm-svn: 147452
diff --git a/clang/test/Modules/Inputs/redecl-merge-right.h b/clang/test/Modules/Inputs/redecl-merge-right.h
index 82051d4..b6dfe2f 100644
--- a/clang/test/Modules/Inputs/redecl-merge-right.h
+++ b/clang/test/Modules/Inputs/redecl-merge-right.h
@@ -1,4 +1,4 @@
-__import_module__ redecl_merge_top;
+@import redecl_merge_top;
 
 @interface Super
 @end
@@ -55,5 +55,5 @@
 #endif
 
 int ONE;
-__import_module__ redecl_merge_top.Explicit;
+@import redecl_merge_top.Explicit;
 const int one = ONE;