This reverts commit b92d6dd704d789240685a336ad8b25a9f381b4cc. See
github.com/llvm/llvm-project/commit/b92d6dd704d7#commitcomment-139992444
We should use a tool like Visual Studio to clean up the headers.
When reconstructing lines from a macro expansion, make sure that lines
at different levels in the expanded code get indented correctly as part
of the macro argument.
MacroUnexpander applies the structural formatting of expanded lines into
UnwrappedLines to the corresponding unexpanded macro calls, resulting in
UnwrappedLines for the macro calls the user typed.
Differential Revision: https://reviews.llvm.org/D88299
