[clang-format] Consider tok::hashhash in python-style comments

Summary: We were missing the case when python-style comments in text protos start with `##`.

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D47870

llvm-svn: 334179
diff --git a/clang/lib/Format/FormatTokenLexer.cpp b/clang/lib/Format/FormatTokenLexer.cpp
index fbd2696..c7f720a4 100644
--- a/clang/lib/Format/FormatTokenLexer.cpp
+++ b/clang/lib/Format/FormatTokenLexer.cpp
@@ -334,7 +334,7 @@
 
 void FormatTokenLexer::tryParsePythonComment() {
   FormatToken *HashToken = Tokens.back();
-  if (HashToken->isNot(tok::hash))
+  if (!HashToken->isOneOf(tok::hash, tok::hashhash))
     return;
   // Turn the remainder of this line into a comment.
   const char *CommentBegin =