[clang] [Modules] Make -module-file-info print macro names in deterministic order (PR #161332)

[Hans Wennborg via cfe-commits]

zmodem wrote:

> LGTM. And I am curious to see the report if available.

This is where it came up: https://crbug.com/448270644

https://github.com/llvm/llvm-project/pull/161332