* YJIT: implement fast path for integer multiplication in opt_mult

* Update yjit/src/codegen.rs

Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>

* Implement mul with overflow checking on arm64

* Fix missing semicolon

* Add arm splitting for lshift, rshift, urshift

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Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>