EnC: Allow signature changes and method/field/etc renames

[davidwengier]

• Simple method renames
  • Emit new method [EnC] Allow renaming methods, properties, events etc. #62364
  • Update old method to trampoline
  • Keep track of the change in a dictionary
• Simple method signature change [EnC] Allow deleting method #61806
  • Emit new method
  • Update old method to throw new MissingMethodException()
  • Keep track of the change in a dictionary
  • Follow up: parameter type changes Issue delete and insert edits when changing parameters #62897
  • Follow up: If parameter types only change, and all types are assignable, or only adding parameters that have default values, this could trampoline too
  • Follow up: Parameter reorder, when different types Allow reordering parameters, inserting, and deleting parameters #64596
  • Follow up: Return type change Support changing return types of methods, properties, events #63486
  • Follow up: Insert/delete parameter Issue delete and insert edits when changing parameters #62897
• Delete method
  • Update old method to throw new MissingMethodException()? [EnC] Allow deleting method #61806
  • Follow up: Allow deleting constructors, properties, indexers, events [EnC] Support more symbol deletes #62151
  • Follow up: Allow deleting virtual/abstract methods (see comment in code referencing this issue)
• Block if active statement in method [EnC] Allow renaming methods, properties, events etc. #62364
• How do breakpoints work?
• We use the dictionary to keep track of renames because if a method gets renamed/changed back to any form it was previously, then we don't emit new methods, we update previous ones [EnC] Allow deleting method #61806
• Non-auto properties work as above (are get_ and set_ methods)
• Auto properties work similar, but ideally we don't change the name of the backing field, so values aren't lost
• Fields will have to lose values
  • Maybe debugger could help?
  • Copy memory, or use EE to re-assign?
• Async methods and methods with lambdas need more thought
  • Do we rename helpers, or reuse?
  • If a method is renamed, then new method will emit new helpers, so maybe will just work
  • Active statement can't be in any nested lambda in a method for a method to be renamed
• Changing parameters on lambdas and local functions themselves