Fix comment alignment behavior.

In the following snippet, clang-format incorrectly aligned the
trailing comment, when only the last line was formatted:

  int aaaaaa; // comment
  int b;
  int c; // Formatting only this line moved this comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180173 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/Format/Format.cpp b/lib/Format/Format.cpp
index 2538f33f50..0c3f85d124 100644
--- a/lib/Format/Format.cpp
+++ b/lib/Format/Format.cpp
@@ -1069,6 +1069,8 @@ public:
         if (TheLine.Last->is(tok::comment))
           Whitespaces.addUntouchableComment(SourceMgr.getSpellingColumnNumber(
               TheLine.Last->FormatTok.Tok.getLocation()) - 1);
+        else
+          Whitespaces.alignComments();
       }
       PreviousLineLastToken = I->Last;
     }