Check with is_in_mmtk_spaces instead of is_mapped_address (#123)

Objects in VM spaces are not 'mmapped' by MMTk, so `is_mapepd_address`
will return `false` for those. But they are still considered as in MMTk
spaces (the VM space).

Note that malloc'd objects are not mapped by MMTk, and not in MMTk
spaces, so both methods will return `false` for malloc'd objects.
However, this seems irrelevant in this scan object code.

Author: qinsoon

mmtk/src/julia_scanning.rs

@@ -2,6 +2,7 @@ use crate::edges::JuliaVMEdge;
 use crate::edges::OffsetEdge;
 use crate::julia_types::*;
 use crate::object_model::mmtk_jl_array_ndims;
+use crate::JuliaVM;
 use crate::JULIA_BUFF_TAG;
 use crate::UPCALLS;
 use mmtk::util::{Address, ObjectReference};
@@ -388,7 +389,7 @@ pub fn process_edge<EV: EdgeVisitor<JuliaVMEdge>>(closure: &mut EV, slot: Addres
     let simple_edge = SimpleEdge::from_address(slot);
     debug_assert!(
         simple_edge.load().is_null()
-            || mmtk::memory_manager::is_mapped_address(simple_edge.load().to_raw_address()),
+            || mmtk::memory_manager::is_in_mmtk_spaces::<JuliaVM>(simple_edge.load()),
         "Object {:?} in slot {:?} is not mapped address",
         simple_edge.load(),
         simple_edge
@@ -442,7 +443,7 @@ pub fn process_offset_edge<EV: EdgeVisitor<JuliaVMEdge>>(
     let offset_edge = OffsetEdge::new_with_offset(slot, offset);
     debug_assert!(
         offset_edge.load().is_null()
-            || mmtk::memory_manager::is_mapped_address(offset_edge.load().to_raw_address()),
+            || mmtk::memory_manager::is_in_mmtk_spaces::<JuliaVM>(offset_edge.load()),
         "Object {:?} in slot {:?} is not mapped address",
         offset_edge.load(),
         offset_edge