Allow instructions to explicitly specify StorageClasses #319

Job	Run time
Lint	53s
Test (windows-2022, x86_64-pc-windows-msvc)	29m 12s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	15m 6s
Test (macOS-latest, x86_64-apple-darwin)	10m 59s
cargo-deny	1m 23s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 43s
test_success	3s
	1h 5m 19s

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