Add `tracing` to `rustc_codegen_spirv` #211

Job	Run time
Lint	1m 46s
cargo-deny	1m 17s
Test (ubuntu-20.04, x86_64-unknown-linux-gnu)	1m 46s
Test (windows-2022, x86_64-pc-windows-msvc)	1m 37s
Test (macOS-latest, x86_64-apple-darwin)	1m 46s
Test (ubuntu-20.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	1m 46s
test_success	1s
	9m 59s

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