[bug] compiler generated override getter/setter for filed in interface incorrectly

[HerrCai0907]

Bug description

I found this bug in our fork: wasm-ecosystem/warpo#203
I guess it's caused by override function does not check the base class.

Steps to reproduce

export interface PropertyName {
 // FIXME: should be inside Node interface
 range: Range;
 kind: NodeKind;
 getReadableName(): string;
}
export class ComputedPropertyName extends Node implements PropertyName {
 constructor(
 public expression: Expression,
 range: Range
 ) {
 super(NodeKind.ComputedPropertyName, range);
 }
 getReadableName(): string {
 return this.range.toString();
 }
}
export abstract class Node {
 constructor(
 /** Kind of this node. */
 public kind: NodeKind,
 /** Source range. */
 public range: Range
 ) {}
}

will generated

 (func $assemblyscript/src/ast/PropertyName#get:kind@override (param $0 i32) (result i32)
 (local $1 i32)
 (drop
 (i32.load
 (i32.sub
 (local.get $0)
 (i32.const 8)
 )
 )
 )
 (unreachable)
 )

AssemblyScript version

all