message: Don't generate an AllocValue for Frozen types
  Summary: You can technically allocate frozen types into the mutable heap, but it's not something you should do, and it's a nice invariant to have that people don't. So remove the generated instances.
diff: @@ -58,12 +58,6 @@ macro_rules! starlark_complex_value {
  }
  }
  - impl<'v> $crate::values::AllocValue<'v> for [< Frozen $x >] {
  - fn alloc_value(self, heap: &'v $crate::values::Heap) -> $crate::values::Value<'v> {
  - heap.alloc_simple(self)
  - }
  - }
  -
  impl $crate::values::SimpleValue for [< Frozen $x >] {}
  impl<'v> $x<'v> {
  