ZJIT: Fn stub: Move args to create appropriate unfilled optional para… #12788

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 19s
make (check, --disable-yjit)	7m 30s
make (test-bundler-parallel, 50)	23m 9s
make (test-bundled-gems)	19m 52s
make (check, cppflags=-DVM_CHECK_MODE)	8m 21s
make (check, --enable-shared --enable-load-relative)	7m 26s
make (check, ubuntu-24.04, capi)	10m 32s
make (check, i686)	11m 12s
make-ibm	0s
Ubuntu result	2s
	1h 42m 23s

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