WIP: Add assembly test for declare_class!

Cargo.toml

@@ -9,3 +9,4 @@ resolver = "2"
 inherits = "release"
 # Enable LTO to allow testing the `unstable-static-sel-inlined` feature
 lto = true
+panic = "abort"

crates/test-assembly/crates/test_declare_class/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "test_declare_class"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+path = "lib.rs"
+
+[dependencies]
+objc2 = { path = "../../../objc2", default-features = false }
+
+[features]
+default = ["apple", "std", "foundation"]
+std = ["objc2/std"]
+# Runtime
+apple = ["objc2/apple"]
+gnustep-1-7 = ["objc2/gnustep-1-7"]
+gnustep-1-8 = ["gnustep-1-7", "objc2/gnustep-1-8"]
+gnustep-1-9 = ["gnustep-1-8", "objc2/gnustep-1-9"]
+gnustep-2-0 = ["gnustep-1-9", "objc2/gnustep-2-0"]
+gnustep-2-1 = ["gnustep-2-0", "objc2/gnustep-2-1"]
+
+foundation = ["objc2/foundation"]
+
+# Hack
+assembly-features = ["foundation"]