Stop using Vector::unsafeAppendWithoutCapacityCheck() in WasmFunctionParser's splitStack().
Pull request: https://github.com/WebKit/WebKit/pull/20355
Committed 270582@main (dad9c5684b0b): <https://commits.webkit.org/270582@main> Reviewed commits have been landed. Closing PR #20355 and removing active labels.
<rdar://problem/118263667>