[libclang] Remove comma from the blacklist of characters that prevent a comment to be attached to a decl.

It's common to use an availability function macro at the start of a decl.
rdar://13965065

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187230 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 8e7b13e..1b46531 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -227,7 +227,7 @@
 
   // There should be no other declarations or preprocessor directives between
   // comment and declaration.
-  if (Text.find_first_of(",;{}#@") != StringRef::npos)
+  if (Text.find_first_of(";{}#@") != StringRef::npos)
     return NULL;
 
   return *Comment;