[clang] [FMV][AIX] Implement target_clones (cpu-only) (PR #177428)

[Alexandros Lamprineas via cfe-commits]

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+// RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -target-cpu pwr7 -emit-llvm %s -o - | FileCheck %s
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labrinea wrote:

Anything with "aarch64" on the filename seems like technical debt and should be migrated to the corresponding folder in my opinion. Same for other targets. See #91783. When adding a new test file it's best to put it at the right place.

https://github.com/llvm/llvm-project/pull/177428