[3.14] gh-128627: Fix iPad detection in wasm-gc (GH-135388) (#135419)

On some iPad versions, Safari reports as "macOS". Modifies the GC trampoline detection
to add a feature-based check to detect this case.
(cherry picked from commit d4471297586335d8c24db8b2c030d32c94570344)

Co-authored-by: Gyeongjae Choi <def6488@gmail.com>