WebAssembly variable instructions

WebAssembly variable instructions.

• local
  • : Declare a new local variable.
• local.get
  • : Load the value of a local variable onto the stack.
• local.set
  • : Set the value of a local variable.
• local.tee
  • : Set the value of a local variable and keep the value on the stack.
• global
  • : Declare a new global variable.
• global.get
  • : Load the value of a global variable onto the stack.
• global.set
  • : Set the value of a global variable.