[clang] [clang][PP] Add extension to predefine target OS macros (PR #74676)

[Florian Hahn via cfe-commits]

fhahn wrote:

Please also see the failures on GreenDragon: 
https://green.lab.llvm.org/green/job/lnt-ctmark-aarch64-Os/15893/console

https://github.com/llvm/llvm-project/pull/74676
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