Fix GH-16572: Incorrect result with reflection in low-trigger JIT

When a recursive call happens with invalid arguments, the maximum valid
arguments are computed and stored in `num_args`,

Fix GH-16572: Incorrect result with reflection in low-trigger JIT

When a recursive call happens with invalid arguments, the maximum valid
arguments are computed and stored in `num_args`, but the RECV entry
block we jump to is `call_num_args` instead. This can skip argument
validation checks. Fix this by using `num_args` instead.

Closes GH-16575.

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