Optimize embedded test

Author: mcroad

.github/workflows/rust.yml

@@ -121,4 +121,4 @@ jobs:
         env:
           RUSTFLAGS: "-C link-arg=-Tlink.x"
           CARGO_TARGET_THUMBV7M_NONE_EABI_RUNNER: "qemu-system-arm -cpu cortex-m3 -machine mps2-an385 -nographic -semihosting-config enable=on,target=native -kernel"
-        run: cd embedded && cargo run --target thumbv7m-none-eabi
+        run: cd embedded && cargo run --target thumbv7m-none-eabi --release

embedded/Cargo.toml

@@ -25,3 +25,4 @@ bench = false
 codegen-units = 1 # better optimizations
 debug = true      # symbols are nice and they don't increase the size on Flash
 lto = true        # better optimizations
+opt-level = "z"