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Address fiber cache leak #23240

Job	Run time
runtime5 poll-insertion (x86_64-linux)	8m 18s
runtime5 dev (x86_64-linux)	6m 38s
runtime5 stack-checks (x86_64-linux)	7m 24s
runtime4 dev (x86_64-linux)	5m 46s
runtime4 Oclassic frame-pointers poll-insertion flambda-invariants (x86_64-linux)	8m 5s
runtime5 debug (x86_64-linux)	9m 54s
runtime5 multidomain (x86_64-linux)	9m 0s
runtime5 multidomain stack-checks (x86_64-linux)	9m 44s
runtime5 debug stack-checks (x86_64-linux)	11m 10s
runtime5 (x86_64-linux)	7m 32s
runtime4 regalloc (x86_64-linux)	11m 46s
runtime5 regalloc (aarch64-darwin)	9m 23s
runtime5 vectorizer (x86_64-linux)	8m 18s
runtime5 frame-pointers irc (x86_64-linux)	8m 38s
runtime4 O3 metrics (x86_64-linux)	8m 21s
runtime4 (aarch64-darwin)	8m 16s
runtime4 O3 (x86_64-linux)	8m 22s
runtime5 debug regalloc (aarch64-darwin)	11m 5s
runtime5 cfg-invariants (x86_64-linux)	8m 16s
runtime4 address-sanitizer (x86_64-linux)	9m 20s
runtime5 regalloc (aarch64-linux)	11m 50s
runtime5 address-sanitizer (x86_64-linux)	10m 5s
runtime5 dwarf-tests (x86_64-linux)	5m 55s
runtime5 frame-pointers llvmize-tests (x86_64-linux)	17m 19s
	3h 40m 25s

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