Prefer any other crate over c-builtins when selecting an upstream monomorphization

Author: saethlin

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -430,8 +430,11 @@ fn upstream_monomorphizations_provider(
                 Occupied(mut e) => {
                     // If there are multiple monomorphizations available,
                     // we select one deterministically.
+                    // Also try to avoid selecting compiler-builtins: #150173
                     let other_cnum = *e.get();
-                    if tcx.stable_crate_id(other_cnum) > tcx.stable_crate_id(cnum) {
+                    if tcx.stable_crate_id(other_cnum) > tcx.stable_crate_id(cnum)
+                        || tcx.is_compiler_builtins(other_cnum)
+                    {
                         e.insert(cnum);
                     }
                 }