Set opt-level = 1 on dev profile

Author: lnicola

Cargo.toml

@@ -6,6 +6,7 @@ exclude = ["crates/proc-macro-test/imp"]
 # Disabling debug info speeds up builds a bunch,
 # and we don't rely on it for debugging that much.
 debug = 0
+opt-level = 1
 
 [profile.dev.package]
 # These speed up local tests.