process: optimize asyncHandledRejections by using FixedQueue #1999

Job	Run time
Build slim tarball	1m 33s
aarch64-linux: with shared libraries	24m 39s
x86_64-linux: with shared libraries	30m 15s
aarch64-darwin: with shared libraries	25m 4s
x86_64-darwin: with shared libraries	41m 13s
	2h 2m 44s

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