clang-format: Fix bug in column-layout formatting.

Specific arrangements of comments after trailing commas could confuse
the column width calculation, e.g. in:

vector<int> x = { a, b,
                  /* some */ /* comment */ };

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189211 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 5606aa1..fed054d 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -3530,7 +3530,7 @@
                "    bbbbbb);");
 }
 
-TEST_F(FormatTest, UndestandsOverloadedOperators) {
+TEST_F(FormatTest, UnderstandsOverloadedOperators) {
   verifyFormat("bool operator<();");
   verifyFormat("bool operator>();");
   verifyFormat("bool operator=();");
@@ -4191,6 +4191,10 @@
                "  1, 1, 1, 1, 1, 1, 1, 1, //\n"
                "};",
                getLLVMStyleWithColumns(39));
+  verifyFormat("vector<int> x = { 1, 1, 1, 1,\n"
+               "                  1, 1, 1, 1,\n"
+               "                  /**/ /**/ };",
+               getLLVMStyleWithColumns(39));
 }
 
 TEST_F(FormatTest, PullTrivialFunctionDefinitionsIntoSingleLine) {