clang-format: Indent correctly in conditional expressions after return.

clang-format: Indent correctly in conditional expressions after return.

This only applies when not aligning after the return itself (which is
commonly done for C++.

Before:
  return aaaaaaaaaa
      ? bbbbbbbbbb(
             bbbbbb)  // This is indented relative to aaaaaaaaaa.
      : b;

After:
  return aaaaaaaaaa
      ? bbbbbbbbbb(
            bbbbbb)
      : b;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223694 91177308-0d34-0410-b5e6-96231b3b80d8