Factored out test program and fuzzing features; core crate now only depends on smallvec and log.

fuzz/Cargo.toml

@@ -10,14 +10,12 @@ edition = "2018"
 cargo-fuzz = true
 
 [dependencies]
+regalloc2 = { path = "../", features = ["fuzzing"] }
 libfuzzer-sys = "0.3"
 arbitrary = { version = "^0.4.6", features = ["derive"] }
 log = { version = "0.4.8", default-features = false }
 env_logger = "0.8.3"
 
-[dependencies.regalloc2]
-path = ".."
-
 # Prevent this from interfering with workspaces
 [workspace]
 members = ["."]