Avoid confusing identations for multi-parameter functions.

Before:
aaaaaaaa(aaaaaaaaa(
    aaaaaaaaaa(),
         aaaaaaaaa);

After:
aaaaaaaa(aaaaaaaaa(
             aaaaaaaaaa(),
         aaaaaaaaa);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173673 91177308-0d34-0410-b5e6-96231b3b80d8