Disable the machine outliner by default

This addresses a codegen-issue that needs to be fixed upstream in LLVM.
While we wait for the fix, we can disable it.

Verified manually that the outliner is no longer run when
`-Copt-level=z` is specified, and also that you can override this with
`-Cllvm-args=-enable-machine-outliner` if you need it anyway.

A regression test is not really feasible in this instance, given that we
do not have any minimal reproducers.

Fixes #85351

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -1,5 +1,5 @@
 use crate::back::write::create_informational_target_machine;
-use crate::llvm;
+use crate::{llvm, llvm_util};
 use libc::c_int;
 use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_data_structures::fx::FxHashSet;
@@ -84,6 +84,17 @@ unsafe fn configure_llvm(sess: &Session) {
         if !sess.opts.debugging_opts.no_generate_arange_section {
             add("-generate-arange-section", false);
         }
+
+        // FIXME(nagisa): disable the machine outliner by default in LLVM versions 11, where it was
+        // introduced and up.
+        //
+        // This should remain in place until https://reviews.llvm.org/D103167 is fixed. If LLVM
+        // has been upgraded since, consider adjusting the version check below to contain an upper
+        // bound.
+        if llvm_util::get_version() >= (11, 0, 0) {
+            add("-enable-machine-outliner=never", false);
+        }
+
         match sess.opts.debugging_opts.merge_functions.unwrap_or(sess.target.merge_functions) {
             MergeFunctions::Disabled | MergeFunctions::Trampolines => {}
             MergeFunctions::Aliases => {