Rollup merge of #80525 - devsnek:wasm64, r=nagisa

wasm64 support

There is still some upstream llvm work needed before this can land.

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -186,7 +186,7 @@ impl<'a> GccLinker<'a> {
         // * On OSX they have their own linker, not binutils'
         // * For WebAssembly the only functional linker is LLD, which doesn't
         //   support hint flags
-        !self.sess.target.is_like_osx && self.sess.target.arch != "wasm32"
+        !self.sess.target.is_like_osx && !self.sess.target.is_like_wasm
     }
 
     // Some platforms take hints about whether a library is static or dynamic.

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -161,7 +161,7 @@ pub fn supported_target_features(sess: &Session) -> &'static [(&'static str, Opt
         "mips" | "mips64" => MIPS_ALLOWED_FEATURES,
         "powerpc" | "powerpc64" => POWERPC_ALLOWED_FEATURES,
         "riscv32" | "riscv64" => RISCV_ALLOWED_FEATURES,
-        "wasm32" => WASM_ALLOWED_FEATURES,
+        "wasm32" | "wasm64" => WASM_ALLOWED_FEATURES,
         _ => &[],
     }
 }