compiler crashed when generic function override non generic function

[Changqing-JING]

Bug description

compiler crashed when generic function override non generic function

Steps to reproduce

var called: string = "";

class A {
  foo<T>(x: T): void {
    called = "A";
  }
}

class B extends A {
  foo(x: i32): void { // non-generic overrides generic
    called = "B";
  }
}

// Static dispatch: B.foo called directly
var b = new B();
b.foo(1);
assert(called == "B");
called = "";

// Virtual dispatch through A reference: which gets called?
var a: A = new B();
a.foo<i32>(1);
assert(called == "B"); // if vtable works, "B"; if fallback to base, "A"

build above code

AssemblyScript version

v0.28.12