Attaching comments to declarations: find comment attached to any redeclaration

Not only look for the comment near the declaration itself, but also walk the
redeclaration chain: the previous declaration might have had a documentation
comment.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161722 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaCodeComplete.cpp b/lib/Sema/SemaCodeComplete.cpp
index 2e099e9..9fa757d 100644
--- a/lib/Sema/SemaCodeComplete.cpp
+++ b/lib/Sema/SemaCodeComplete.cpp
@@ -2543,7 +2543,7 @@
 
   if (IncludeBriefComments) {
     // Add documentation comment, if it exists.
-    if (const RawComment *RC = Ctx.getRawCommentForDecl(ND)) {
+    if (const RawComment *RC = Ctx.getRawCommentForAnyRedecl(ND)) {
       Result.addBriefComment(RC->getBriefText(Ctx));
     }
   }