executor: apply optnone to guest_handle_nested_vmentry_intel() #18371

Job	Run time
aux	4m 1s
build	4m 42s
arch (presubmit_arch_windows)	3m 31s
arch (presubmit_arch_openbsd)	3m 52s
dashboard	2m 35s
arch (presubmit_arch_darwin)	3m 50s
arch (presubmit_arch_linux)	9m 41s
gvisor	4m 4s
arch (presubmit_arch_netbsd)	3m 27s
arch (presubmit_arch_executor)	3m 18s
race	7m 29s
arch (presubmit_arch_freebsd)	6m 26s
old	7m 9s
race_dashboard	4m 25s
	1h 8m 30s

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