Auto merge of #76830 - Artoria2e5:tune, r=nagisa

Pass tune-cpu to LLVM

I think this is how it should work...

See https://internals.rust-lang.org/t/expose-tune-cpu-from-llvm/13088 for the background. Or the documentation diff.

compiler/rustc_codegen_llvm/src/context.rs

@@ -417,7 +417,8 @@ impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     }
 
     fn apply_target_cpu_attr(&self, llfn: &'ll Value) {
-        attributes::apply_target_cpu_attr(self, llfn)
+        attributes::apply_target_cpu_attr(self, llfn);
+        attributes::apply_tune_cpu_attr(self, llfn);
     }
 
     fn create_used_variable(&self) {