Rollup merge of #132174 - RalfJung:pclmulqdq, r=calebzulawski

x86 target features: make pclmulqdq imply sse2

Based on comments in https://github.com/rust-lang/stdarch/issues/1661

Fixes https://github.com/rust-lang/stdarch/issues/1661

compiler/rustc_target/src/target_features.rs

@@ -316,7 +316,7 @@ pub fn is_stable(self) -> bool {
     ("lahfsahf", Unstable(sym::lahfsahf_target_feature), &[]),
     ("lzcnt", Stable, &[]),
     ("movbe", Stable, &[]),
-    ("pclmulqdq", Stable, &[]),
+    ("pclmulqdq", Stable, &["sse2"]),
     ("popcnt", Stable, &[]),
     ("prfchw", Unstable(sym::prfchw_target_feature), &[]),
     ("rdrand", Stable, &[]),