[clang] [llvm] [PowerPC][AIX] Support #pragma comment copyright for AIX (PR #178184)

[Wael Yehia via llvm-commits]

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w2yehia wrote:

Also, the ifdef splitting of this test can be avoided by using split-file, that way the boundaries of each file are clearly defined and the reader/maintainer doesn't have to preprocess the file in their heads.
The diagnostics part of this file is essentially two files/parts, and I think they can be combined into a single non-ifdef'ed file.

https://github.com/llvm/llvm-project/pull/178184