[meta] Generate lazy function for function declaration

[arai-a]

The plan is the following:

1. compile all functions as lazy function (still disabled)
   * so that the enclosing script can pass compilation, while developing
2. implement closed over bindings and environment object
   * almost ready. needs some accessor/trait
3. implement lexical scope with environment object
   * EnvironmentObject/PushLexicalEnv/PopLexicalEnv
   * this can be a preparation for:
   • closed over bindings
   • direct eval (not for this issue)
   • with (not for this issue)
4. enable lazy function compilation
   • so that the enclosing script is fully compiled
5. implement delazification, including:
   • API between jsparagus and smoosh
   • bytecode compilation of function parameter and body
6. implement eager compilation of functions
   • use the helper structs created in step 5

[arai-a]

dependency:

• 1
  • Add stencil crate #531 Add stencil crate
  • Update ScriptStencil #529 Update ScriptStencil
  • Create FunctionStencil in scope pass #535 Create FunctionStencil in scope pass
  • Compile non-top-level function declarations #537 Compile non-top-level function declarations
  • Support Annex B.3.3 #538 Support Annex B.3.3
  • Compute some ImmutableScriptFlags for functions #539 Compute some ImmutableScriptFlags for functions
  • Handle this/arguments in FreeNameTracker caller #546 Handle this/arguments in FreeNameTracker caller
  • Merge ScriptStencil and ScriptStencilBase and FunctionStencil, and move bytecode etc to ImmutableScriptData #554 Merge ScriptStencil and ScriptStencilBase and FunctionStencil, and move bytecode etc to ImmutableScriptData
• 2
  • Factor out common fields from ScopeData #486 Factor out common fields from ScopeData
• 3
  • Support aliased var #536 Support aliased var
  • Reject unsupported syntax that affects scope #602 Reject unsupported syntax that affects scope
  • Return NotImplemented for super #613 Return NotImplemented for super
  • Reject private fields until --enable-private-fields shell option is removed #604 Reject private fields until --enable-private-fields shell option is removed
• 4
  • Bug 1641202 - Decouple Stencil instantiation from FunctionBox/SharedContext
  • Bug 1648574 - Support function-related stencil
  • Bug 1655386 - Support function-related scopes and resolve aliases
  • Bug 1655386 - Preparation for function stencil
  • Enable lazy function #617 Enable lazy function

[arai-a]

The next step is to map jsparagus stencil to m-c stencil, for functions, in smoosh side