Implement support for the extremely atrocious MS /##/ extension, 
which pastes together a comment.  This is only enabled with 
-fms-extensions of course.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46845 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/macro_paste_mscomment.c b/test/Preprocessor/macro_paste_mscomment.c
new file mode 100644
index 0000000..7e06b6d
--- /dev/null
+++ b/test/Preprocessor/macro_paste_mscomment.c
@@ -0,0 +1,19 @@
+// RUN: clang %s -fsyntax-only -fms-extensions
+// This horrible stuff should preprocess into (other than whitespace):
+//   int foo;
+//   int bar;
+//   int baz;
+
+int foo;
+
+#define comment /##/  dead tokens live here
+comment This is stupidity
+
+int bar;
+
+#define nested(x) int x comment cute little dead tokens...
+
+nested(baz)  rise of the dead tokens
+
+;
+