[Debug info] Dump macro expansion buffers to disk for debug info to reference #63125
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When emitting debug info that references into a macro expansion, dump
the macro expansion buffer into a file on disk (in the temporary
directory) so that one can see the macro expansion buffers in the
source files themselves.
And thanks to the @adrian-prantl, emit "inline call" debug scopes for macro expansion expressions. The end result of this is that LLDB can "step into" a macro expansion expression to walk through the expanded code.
Implements a big chunk of rdar://102916513.