rewrite msvc-opt-minsize to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -107,7 +107,6 @@ run-make/mingw-export-call-convention/Makefile
 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/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-whole-archive/Makefile
 run-make/no-alloc-shim/Makefile

tests/run-make/msvc-opt-minsize/Makefile

@@ -0,0 +1,19 @@
+// A previously outdated version of LLVM caused compilation failures on Windows
+// specifically with optimization level `z`. After the update to a more recent LLVM
+// version, this test checks that compilation and execution both succeed.
+// See https://github.com/rust-lang/rust/issues/45034
+
+// NOTE: This isn't an UI test despite its simplicity, because UI tests
+// cannot contain opt-level modifications.
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+//@ only-windows
+// Reason: the observed bug only occurs on Windows
+
+use run_make_support::{run, rustc};
+
+fn main() {
+    rustc().input("foo.rs").opt_level("z").run();
+    run("foo");
+}