Rollup merge of #134042 - sayantn:power8-crypto, r=jieyouxu

Add the `power8-crypto` target feature

Add the `power8-crypto` target feature. This will enable adding some new PPC intrinsics in stdarch (specifically AES, SHA and CLMUL intrinsics). The implied target feature is from [here](https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/PowerPC/PPC.td)

```@rustbot``` label A-target-feature O-PowerPC

Author: fmease

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -230,6 +230,8 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea
         "aarch64"
     } else if sess.target.arch == "sparc64" {
         "sparc"
+    } else if sess.target.arch == "powerpc64" {
+        "powerpc"
     } else {
         &*sess.target.arch
     };
@@ -289,6 +291,7 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea
         // https://github.com/llvm/llvm-project/blob/llvmorg-18.1.0/llvm/lib/Target/Sparc/MCTargetDesc/SparcELFObjectWriter.cpp#L26
         ("sparc", "v8plus") if get_version().0 == 19 => Some(LLVMFeature::new("v9")),
         ("sparc", "v8plus") if get_version().0 < 19 => None,
+        ("powerpc", "power8-crypto") => Some(LLVMFeature::new("crypto")),
         (_, s) => Some(LLVMFeature::new(s)),
     }
 }

compiler/rustc_target/src/target_features.rs

@@ -412,6 +412,7 @@ const POWERPC_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     ("partword-atomics", Unstable(sym::powerpc_target_feature), &[]),
     ("power10-vector", Unstable(sym::powerpc_target_feature), &["power9-vector"]),
     ("power8-altivec", Unstable(sym::powerpc_target_feature), &["altivec"]),
+    ("power8-crypto", Unstable(sym::powerpc_target_feature), &["power8-altivec"]),
     ("power8-vector", Unstable(sym::powerpc_target_feature), &["vsx", "power8-altivec"]),
     ("power9-altivec", Unstable(sym::powerpc_target_feature), &["power8-altivec"]),
     ("power9-vector", Unstable(sym::powerpc_target_feature), &["power8-vector", "power9-altivec"]),

tests/ui/check-cfg/target_feature.stderr

@@ -153,6 +153,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `popcnt`
 `power10-vector`
 `power8-altivec`
+`power8-crypto`
 `power8-vector`
 `power9-altivec`
 `power9-vector`