[cpp] Invalid code generated from `Int` to `cpp.Star<Int>` cast

[tobil4sk]

function main() {
	final a:Int = 10;
	final b:cpp.Star<Int> = a;
}

Error: ./src/_Main/Main_Fields_.cpp: In static member function ‘static void _Main::Main_Fields__obj::main()’:
./src/_Main/Main_Fields_.cpp:29:19: error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]
   29 |         int * b = a;
      |                   ^
      |                   |
      |                   int
./src/_Main/Main_Fields_.cpp:29:19: note: possible fix: take the address with ‘&’
   29 |         int * b = a;
      |                   ^
      |                   &

Also, code like this should not be permitted as you cannot get a pointer to temporary rvalue:

function main() {
	final a:cpp.Star<Int> = 10;
}

This should be handled similarly to #12457.

Also compare with a similar error on the hashlink target:

[ERROR] Test.hx:3: characters 41-43

 3 |     final ref:hl.Ref<Int> = hl.Ref.make(10);
   |                                         ^^
   | Ref should be a local variable