[clang] [llvm] [PowerPC] Support -fpatchable-function-entry (PR #92997)

[Fangrui Song via cfe-commits]

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+; RUN: llc -mtriple=powerpc-unknown-linux-gnu %s -o - | FileCheck %s --check-prefixes=CHECK,PPC32
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MaskRay wrote:

`-mtriple=powerpc`. Prefer a generic ELF triple to a Linux specific one.

Suggest 2 RUN lines, `powerpc` and `powerpc64le`, to catch both 32-bit/64-bit and LE/BE.

https://github.com/llvm/llvm-project/pull/92997