clang-format: Add option to control call argument bin-packing separately

This is desirable for the Chromium style guide:
http://www.chromium.org/developers/coding-style

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@219400 91177308-0d34-0410-b5e6-96231b3b80d8