Refactoring store liveness update #79724
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Following up 79182. When storing a variable means a spill, we are updating its liveness and setting the register to REG_STK. When the target is a register and not the stack, then we usually call genProduceReg which triggers the liveness update. This pr refactor similar code to avoid unintentional changes breaking either var home or var liveness and fix one case on arm 64 which was not considered (emitIns_S_R and emitIns_R_I don't update var home).