SSE4, TBM, and ADX do not need feature flags

Author: gnzlbg

src/librustc_codegen_llvm/llvm_util.rs

@@ -129,7 +129,7 @@ const AARCH64_WHITELIST: &[(&str, Option<Symbol>)] = &[
 ];
 
 const X86_WHITELIST: &[(&str, Option<Symbol>)] = &[
-    ("adx", Some(sym::adx_target_feature)),
+    ("adx", None),
     ("aes", None),
     ("avx", None),
     ("avx2", None),
@@ -163,9 +163,9 @@ const X86_WHITELIST: &[(&str, Option<Symbol>)] = &[
     ("sse3", None),
     ("sse4.1", None),
     ("sse4.2", None),
-    ("sse4a", Some(sym::sse4a_target_feature)),
+    ("sse4a", None),
     ("ssse3", None),
-    ("tbm", Some(sym::tbm_target_feature)),
+    ("tbm", None),
     ("xsave", None),
     ("xsavec", None),
     ("xsaveopt", None),

src/librustc_typeck/collect.rs

@@ -2367,11 +2367,6 @@ fn from_target_feature(
                 Some(sym::movbe_target_feature) => rust_features.movbe_target_feature,
                 Some(sym::rtm_target_feature) => rust_features.rtm_target_feature,
                 Some(sym::f16c_target_feature) => rust_features.f16c_target_feature,
-                // These are stable:
-                | Some(sym::sse4a_target_feature)
-                | Some(sym::tbm_target_feature)
-                | Some(sym::adx_target_feature)
-                    => true,
                 Some(name) => bug!("unknown target feature gate {}", name),
                 None => true,
             };