[Refactor] Simplify runtime function definition (#3429)
[Refactor] Simplify runtime function definition (#3429)

* [Refactor] Simplify runtime function definition

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Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi