Optimize aarch64 tests

Attempt to combat the slowness of emulators
for this particular platform, which are oddly
even slower than I expect in general.

It probably doesn't help that they run all tests
except for the handful of x86-specific ones.

Author: workingjubilee

Cargo.toml

@@ -41,3 +41,6 @@ optional = true
 # Keep in sync with the version on Dockerfile.
 wasm-bindgen = "=0.2.87"
 wasm-bindgen-test = "=0.3.37"
+
+[target.'cfg(target_arch = "aarch64")'.profile.dev]
+opt-level = 3 # slow emulators