refactor(turbo-tasks-memory): Minor cleanup of code in turbo-tasks-me… #10783

Job	Run time
build-wasm (web)	23s
build	2m 24s
build-wasm (nodejs)	26s
deploy-target	10s
stable - aarch64-apple-darwin - node@16	2m 0s
stable - x86_64-pc-windows-msvc - node@16	8m 48s
stable - x86_64-unknown-linux-gnu - node@16	53s
Deploy examples	0s
Deploy preview tarball	2m 0s
Potentially publish release	0s
Upload Turbopack Bytesize metrics to Datadog	0s
Release Stats	0s
	17m 4s

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