Ensure Cranelift errors are reported deterministically

This may also have been the root cause of #1310.

src/driver/aot.rs

@@ -108,6 +108,8 @@ pub(crate) fn join(
 
         self.concurrency_limiter.finished();
 
+        sess.abort_if_errors();
+
         (
             CodegenResults {
                 modules,
@@ -411,8 +413,6 @@ pub(crate) fn run_aot(
             .collect::<Vec<_>>()
     });
 
-    tcx.sess.abort_if_errors();
-
     let mut allocator_module = make_module(tcx.sess, &backend_config, "allocator_shim".to_string());
     let mut allocator_unwind_context = UnwindContext::new(allocator_module.isa(), true);
     let created_alloc_shim =