Fix restriction comparison between Metaclass and Path

[HertzDevil]

Fixes #12516.

Also orders all metaclasses before superclasses of Class, in particular Object and Value:

def foo(x : Object)
  1
end

def foo(x : Int32.class)
  2
end

# 1 before this PR
foo(Int32) # => 2

[asterite]

Thank you!