Remove AMX and SHA512

These would need a new feature

Author: sayantn

Diff for: compiler/rustc_target/src/target_features.rs

@@ -192,11 +192,6 @@ const X86_ALLOWED_FEATURES: &[(&str, Stability)] = &[
     // tidy-alphabetical-start
     ("adx", Stable),
     ("aes", Stable),
-    ("amx-bf16", Stable),
-    ("amx-complex", Stable),
-    ("amx-fp16", Stable),
-    ("amx-int8", Stable),
-    ("amx-tile", Stable),
     ("avx", Stable),
     ("avx2", Stable),
     ("avx512bf16", Unstable(sym::avx512_target_feature)),
@@ -236,9 +231,6 @@ const X86_ALLOWED_FEATURES: &[(&str, Stability)] = &[
     ("rdseed", Stable),
     ("rtm", Unstable(sym::rtm_target_feature)),
     ("sha", Stable),
-    ("sha512", Stable),
-    ("sm3", Stable),
-    ("sm4", Stable),
     ("sse", Stable),
     ("sse2", Stable),
     ("sse3", Stable),