[PATCH] [ms compatibility] Fix for PR9984.

[Alexey Bataev]

================
Comment at: lib/Lex/TokenLexer.cpp:524
@@ -515,2 +523,3 @@
     PasteOpLoc = Tokens[CurToken].getLocation();
-    ++CurToken;
+    if (Tokens[CurToken].is(tok::hashhash))
+      ++CurToken;
----------------
majnemer wrote:
> What's the rationale behind this change?
In construct `L#x` we don't have `##` that should be skipped. So I just check it and skip this `##` only if it exists.

http://reviews.llvm.org/D6604

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