Clean up CodeItemAccessors and Compact/StandardDexFile

Change constructor to use a reference to a dex file.

Remove duplicated logic for GetCodeItemSize.

Bug: 63756964
Test: test-art-host
Change-Id: I69af8b93abdf6bdfa4454e16db8f4e75883bca46
diff --git a/compiler/debug/elf_debug_info_writer.h b/compiler/debug/elf_debug_info_writer.h
index e2bea8e..713f8eb 100644
--- a/compiler/debug/elf_debug_info_writer.h
+++ b/compiler/debug/elf_debug_info_writer.h
@@ -49,7 +49,7 @@
 
 static std::vector<const char*> GetParamNames(const MethodDebugInfo* mi) {
   std::vector<const char*> names;
-  CodeItemDebugInfoAccessor accessor(mi->dex_file, mi->code_item);
+  CodeItemDebugInfoAccessor accessor(*mi->dex_file, mi->code_item);
   if (accessor.HasCodeItem()) {
     DCHECK(mi->dex_file != nullptr);
     const uint8_t* stream = mi->dex_file->GetDebugInfoStream(accessor.DebugInfoOffset());
@@ -163,7 +163,7 @@
     for (auto mi : compilation_unit.methods) {
       DCHECK(mi->dex_file != nullptr);
       const DexFile* dex = mi->dex_file;
-      CodeItemDebugInfoAccessor accessor(dex, mi->code_item);
+      CodeItemDebugInfoAccessor accessor(*dex, mi->code_item);
       const DexFile::MethodId& dex_method = dex->GetMethodId(mi->dex_method_index);
       const DexFile::ProtoId& dex_proto = dex->GetMethodPrototype(dex_method);
       const DexFile::TypeList* dex_params = dex->GetProtoParameters(dex_proto);
diff --git a/compiler/debug/elf_debug_line_writer.h b/compiler/debug/elf_debug_line_writer.h
index 9910e7a..4e37f4e 100644
--- a/compiler/debug/elf_debug_line_writer.h
+++ b/compiler/debug/elf_debug_line_writer.h
@@ -159,7 +159,7 @@
       PositionInfos dex2line_map;
       DCHECK(mi->dex_file != nullptr);
       const DexFile* dex = mi->dex_file;
-      CodeItemDebugInfoAccessor accessor(dex, mi->code_item);
+      CodeItemDebugInfoAccessor accessor(*dex, mi->code_item);
       const uint32_t debug_info_offset = accessor.DebugInfoOffset();
       if (!dex->DecodeDebugPositionInfo(debug_info_offset, PositionInfoCallback, &dex2line_map)) {
         continue;
diff --git a/compiler/debug/elf_debug_loc_writer.h b/compiler/debug/elf_debug_loc_writer.h
index 34c2919..9ea9f01 100644
--- a/compiler/debug/elf_debug_loc_writer.h
+++ b/compiler/debug/elf_debug_loc_writer.h
@@ -149,7 +149,7 @@
     DCHECK_LT(stack_map_index, dex_register_maps.size());
     DexRegisterMap dex_register_map = dex_register_maps[stack_map_index];
     DCHECK(dex_register_map.IsValid());
-    CodeItemDataAccessor accessor(method_info->dex_file, method_info->code_item);
+    CodeItemDataAccessor accessor(*method_info->dex_file, method_info->code_item);
     reg_lo = dex_register_map.GetDexRegisterLocation(
         vreg, accessor.RegistersSize(), code_info, encoding);
     if (is64bitValue) {