copy: Wasm text instruction

;; Copy data in default memory from [100, 125] to [50, 75]
i32.const 50 ;; Destination address to copy to
i32.const 100 ;; Source address to copy from
i32.const 25 ;; Number of bytes to copy
memory.copy  ;; Copy memory
;; Copy in default memory using an S-function
(memory.copy (i32.const 50) (i32.const 100) (i32.const 25))

;; Copy data in specific memory  [100, 125] to [50, 75]
i32.const 50 ;; Destination address to copy to
i32.const 100 ;; Source address to copy from
i32.const 25 ;; Number of bytes to copy
memory.copy (memory 2)  ;; Copy memory within memory with index 2
;; Copy within memory referenced by its name
i32.const 50 ;; Destination address to copy to
i32.const 100 ;; Source address to copy from
i32.const 25 ;; Number of bytes to copy
memory.copy (memory $memoryName) ;; Copy memory with memory named "$memoryName"
;; Copy same memory using an S function
(memory.copy (memory $memoryName) (i32.const 50) (i32.const 100) (i32.const 25))