Fix an error in formatting of for-loops.

Two minor changes:
* Slight penalty for breaking at "," as opposed to ";".
* Don't apply bin-packing rules to for-loops.

Before:
for (int aaaaaa = aaaaaaaaaa; aaaaaa < bbbbbbbb; ++aaaaaa,
         ++ccccccccccccccc) {}

After:
for (int aaaaaa = aaaaaaaaaa; aaaaaa < bbbbbbbb;
     ++aaaaaa, ++ccccccccccccccc) {}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174308 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index 1eb7021..0676df6 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -714,8 +714,10 @@
       (Left.isNot(tok::comma) && Left.isNot(tok::semi)))
     return 20;
 
-  if (Left.is(tok::semi) || Left.is(tok::comma))
+  if (Left.is(tok::semi))
     return 0;
+  if (Left.is(tok::comma))
+    return 1;
 
   // In Objective-C method expressions, prefer breaking before "param:" over
   // breaking after it.