[llvm] [PowerPC] Specify inlining behavior in TableGen (PR #206938)

[Nikita Popov via llvm-commits]

nikic wrote:

Yes, this is useful for inlining in Rust when functions have different `#[target_features]`. This will make sure that there are no regressions due to https://github.com/llvm/llvm-project/pull/206938 (otherwise there is a risk that SIMD builtins don't get inlined anymore).

https://github.com/llvm/llvm-project/pull/206938