[heap] Bundle platform-specific constants for CodeRange

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index cbc6d72ad839a31822e64cbd93df6503ccca5133..82c709dce134635373a59852d60f7b77e735a349 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3327,8 +3327,7 @@ AllocationResult Heap::AllocateCode(int object_size, bool immovable) {
   result->set_map_no_write_barrier(code_map());
   Code* code = Code::cast(result);
   DCHECK(IsAligned(bit_cast<intptr_t>(code->address()), kCodeAlignment));
-  DCHECK(memory_allocator()->code_range() == NULL ||
-         !memory_allocator()->code_range()->valid() ||
+  DCHECK(!memory_allocator()->code_range()->valid() ||
          memory_allocator()->code_range()->contains(code->address()) ||
          object_size <= code_space()->AreaSize());
   code->set_gc_metadata(Smi::FromInt(0));
@@ -3354,8 +3353,7 @@ AllocationResult Heap::CopyCode(Code* code) {
 
   // Relocate the copy.
   DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
-  DCHECK(memory_allocator()->code_range() == NULL ||
-         !memory_allocator()->code_range()->valid() ||
+  DCHECK(!memory_allocator()->code_range()->valid() ||
          memory_allocator()->code_range()->contains(code->address()) ||
          obj_size <= code_space()->AreaSize());
   new_code->Relocate(new_addr - old_addr);
@@ -3424,8 +3422,7 @@ AllocationResult Heap::CopyCode(Code* code, Vector<byte> reloc_info) {
 
   // Relocate the copy.
   DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
-  DCHECK(memory_allocator()->code_range() == NULL ||
-         !memory_allocator()->code_range()->valid() ||
+  DCHECK(!memory_allocator()->code_range()->valid() ||
          memory_allocator()->code_range()->contains(code->address()) ||
          new_obj_size <= code_space()->AreaSize());