Fix invalid formatting with spaces before trailing comments.

In google style, trailing comments are separated by two spaces. This
patch fixes the counting of these spaces and prevents clang-format from
creating a line with 81 columns.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 83e4fc5..97445c5 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -493,6 +493,9 @@
                "  // B\n"
                "  \"aaaaa\",\n"
                "};");
+  verifyGoogleFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+      "    aaaaaaaaaaaaaaaaaaaaaa);  // 81 cols with this comment");
 }
 
 TEST_F(FormatTest, UnderstandsMultiLineComments) {