CFE crashes on unresolved identifier when constructor tearoffs are enabled.

[leafpetersen]

The code below (taken from co19/Language/Expressions/Instance_Creation/Const/accessibility_t03 here crashes the CFE when constructor tearoffs are enabled. See here for a crashing try bot run.

cc @johnniwinther @devoncarew

func() {}

main() {
  const func();
//      ^
// [analyzer] unspecified
// [cfe] unspecified
}

[leafpetersen]

I believe that this may be the same crash seen in all of these tests:

co19/Language/Expressions/Instance_Creation/Const/accessibility_t03
co19/Language/Expressions/Instance_Creation/Const/accessibility_t05
co19/Language/Expressions/Instance_Creation/New/type_t03
co19/Language/Metadata/compilation_t02
co19/Language/Overview/Scoping/hiding_declaration_t28

see here for logs.