WebAssembly memory instructions.
  - Grow
- 
    Increase the size of the memory instance. 
- Size
- 
    Get the size of the memory instance. 
- Load
- 
    Load a number from memory. 
- Store
- 
    Store a number in memory. 
- Copy
- 
    Copy data from one region in memory to another 
- Fill
- 
    Set all values in a region to a specific byte