Migrate run-make/multiple-emits to rmake.rs

Author: GuillaumeGomez

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -145,7 +145,6 @@ run-make/mismatching-target-triples/Makefile
 run-make/missing-crate-dependency/Makefile
 run-make/mixing-libs/Makefile
 run-make/msvc-opt-minsize/Makefile
-run-make/multiple-emits/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-verbatim-linker/Makefile
 run-make/native-link-modifier-verbatim-rustc/Makefile

tests/run-make/multiple-emits/Makefile

@@ -0,0 +1,13 @@
+use run_make_support::{cwd, path, rustc};
+
+fn main() {
+    rustc().input("foo.rs").emit("asm,llvm-ir").output("out").run();
+
+    assert!(path("out.ll").is_file());
+    assert!(path("out.s").is_file());
+
+    rustc().input("foo.rs").emit("asm,llvm-ir").output("out2.ext").run();
+
+    assert!(path("out2.ll").is_file());
+    assert!(path("out2.s").is_file());
+}