When breaking at function calls, indent from function name.

Otherwise (when indenting from the wrapped -> or .), this looks
like a confusing indent.

Before:
aaaaaaa        //
    .aaaaaaa( //
        aaaaaaa);
After:
aaaaaaa        //
    .aaaaaaa( //
         aaaaaaa);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181595 91177308-0d34-0410-b5e6-96231b3b80d8