feat(tests): add test for linker errors caused by x86 obj files in wasm compiler_builtins

Author: JayAndJef

tests/run-make/wasm-builtins-no-linker-warning/foo.rs

@@ -0,0 +1,3 @@
+fn main() {
+    ()
+}

tests/run-make/wasm-builtins-no-linker-warning/rmake.rs

@@ -0,0 +1,7 @@
+//@ only-wasm32-bare
+
+use run_make_support::rustc;
+
+fn main() {
+    rustc().input("foo.rs").target("wasm32-unknown-unknown").arg("-D").arg("linker-messages").run();
+}