Fix: EventLoop::Polling::FiberEvent [fixup #14996] #13095

Job	Run time
check_format	1m 38s
x86_64-gnu-test (1.7.3)	33m 25s
x86_64-gnu-test (1.8.2)	37m 15s
x86_64-gnu-test-preview_mt	5m 46s
x86_64-gnu-test (1.9.2)	34m 21s
x86_64-musl-test	35m 24s
x86_64-gnu-test (1.10.1)	33m 3s
x86_64-gnu-test (1.11.2)	35m 29s
x86_64-gnu-test (1.12.2)	36m 50s
x86_64-gnu-test (1.13.3)	31m 56s
x86_64-gnu-test (1.14.0)	32m 16s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 11s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 52s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	32m 12s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	33m 21s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	31m 16s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 15s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 25s
	9h 5m 55s

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