clang-format: Fix weird alignment when not aligning after brackets.

Before:
  bbbbbbbbbbbb(aaaaaaaaaaaaaaaaaaaaaaaa, //
      ccccccc(aaaaaaaaaaaaaaaaa, //
	           b));

After:
  bbbbbbbbbbbb(aaaaaaaaaaaaaaaaaaaaaaaa, //
      ccccccc(aaaaaaaaaaaaaaaaa, //
     	  b));

This fixes llvm.org/PR24905.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260080 91177308-0d34-0410-b5e6-96231b3b80d8