ZJIT: Fn stub: Move args to create appropriate unfilled optional para… #12807

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 28s
make (test-bundler-parallel, 50)	23m 21s
make (test-bundled-gems)	13m 57s
make (check, --enable-shared --enable-load-relative)	7m 41s
make (check, ubuntu-24.04, capi)	10m 30s
make (check, cppflags=-DVM_CHECK_MODE)	8m 33s
make (check, --disable-yjit)	7m 22s
make (check, i686)	11m 39s
make-ibm	0s
Ubuntu result	2s
	1h 37m 33s

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