extract s390x vector and friends to their own rust feature

Author: folkertdev

crates/core_arch/src/lib.rs

@@ -22,7 +22,7 @@
     arm_target_feature,
     mips_target_feature,
     powerpc_target_feature,
-    s390x_target_feature,
+    s390x_target_feature_vector,
     loongarch_target_feature,
     wasm_target_feature,
     abi_unadjusted,