Fix aligning of comments that are at the start of the line.

Now correctly leaves:
f(); // comment
// comment
g(); // comment
... alone if the middle comment was aligned with g() before formatting.

llvm-svn: 182605
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 1215be1..5346bdc 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -650,6 +650,13 @@
             format("lineWith();   // comment\n"
                    " // at start\n"
                    "otherLine();"));
+
+  EXPECT_EQ("lineWith(); // comment\n"
+            "// at start\n"
+            "otherLine(); // comment",
+            format("lineWith();   // comment\n"
+                   "// at start\n"
+                   "otherLine();   // comment"));
 }
 
 TEST_F(FormatTest, CanFormatCommentsLocally) {