ART: Move dex structs into own header

Separating out the structs from DexFile allows them to be forward-
declared, which reduces the need to include the dex_file header.

Bug: 119869270
Test: m
Change-Id: I32dde5a632884bca7435cd584b4a81883de2e7b4
diff --git a/compiler/debug/elf_debug_info_writer.h b/compiler/debug/elf_debug_info_writer.h
index bb550b3..a63f241 100644
--- a/compiler/debug/elf_debug_info_writer.h
+++ b/compiler/debug/elf_debug_info_writer.h
@@ -152,9 +152,9 @@
       DCHECK(mi->dex_file != nullptr);
       const DexFile* dex = mi->dex_file;
       CodeItemDebugInfoAccessor accessor(*dex, mi->code_item, mi->dex_method_index);
-      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);
+      const dex::MethodId& dex_method = dex->GetMethodId(mi->dex_method_index);
+      const dex::ProtoId& dex_proto = dex->GetMethodPrototype(dex_method);
+      const dex::TypeList* dex_params = dex->GetProtoParameters(dex_proto);
       const char* dex_class_desc = dex->GetMethodDeclaringClassDescriptor(dex_method);
       const bool is_static = (mi->access_flags & kAccStatic) != 0;
 
diff --git a/compiler/debug/elf_debug_writer.cc b/compiler/debug/elf_debug_writer.cc
index 0f2d73e..16f163b 100644
--- a/compiler/debug/elf_debug_writer.cc
+++ b/compiler/debug/elf_debug_writer.cc
@@ -54,7 +54,7 @@
   WriteCFISection(builder, debug_info.compiled_methods, cfi_format, write_oat_patches);
 
   // Group the methods into compilation units based on class.
-  std::unordered_map<const DexFile::ClassDef*, ElfCompilationUnit> class_to_compilation_unit;
+  std::unordered_map<const dex::ClassDef*, ElfCompilationUnit> class_to_compilation_unit;
   for (const MethodDebugInfo& mi : debug_info.compiled_methods) {
     if (mi.dex_file != nullptr) {
       auto& dex_class_def = mi.dex_file->GetClassDef(mi.class_def_index);
diff --git a/compiler/debug/method_debug_info.h b/compiler/debug/method_debug_info.h
index 729c403..152db6e 100644
--- a/compiler/debug/method_debug_info.h
+++ b/compiler/debug/method_debug_info.h
@@ -32,7 +32,7 @@
   size_t class_def_index;
   uint32_t dex_method_index;
   uint32_t access_flags;
-  const DexFile::CodeItem* code_item;
+  const dex::CodeItem* code_item;
   InstructionSet isa;
   bool deduped;
   bool is_native_debuggable;