Move Assemblers to the Arena.

And clean up some APIs to return std::unique_ptr<> instead
of raw pointers that don't communicate ownership.

Change-Id: I3017302307a0253d661240750298802fb0d9585e
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 3049128..45d23fe 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -777,7 +777,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
-      assembler_(),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       uint32_literals_(std::less<uint32_t>(),
                        graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index c978aaa..efe4c06 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -904,6 +904,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       uint32_literals_(std::less<uint32_t>(),
                        graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index 185397c..12d1164 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -471,7 +471,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
-      assembler_(&isa_features),
+      assembler_(graph->GetArena(), &isa_features),
       isa_features_(isa_features) {
   // Save RA (containing the return address) to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(RA));
diff --git a/compiler/optimizing/code_generator_mips64.cc b/compiler/optimizing/code_generator_mips64.cc
index 246f5b7..56ac38e 100644
--- a/compiler/optimizing/code_generator_mips64.cc
+++ b/compiler/optimizing/code_generator_mips64.cc
@@ -417,6 +417,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features) {
   // Save RA (containing the return address) to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(RA));
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index 304cf08..1a4e62e 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -795,13 +795,16 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       method_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       relative_call_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       pc_relative_dex_cache_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       simple_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       string_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
-      fixups_to_jump_tables_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)) {
+      constant_area_start_(-1),
+      fixups_to_jump_tables_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
+      method_address_offset_(-1) {
   // Use a fake return address register to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(kFakeReturnRegister));
 }
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 056b69b..59cc444 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -1007,6 +1007,7 @@
         location_builder_(graph, this),
         instruction_visitor_(graph, this),
         move_resolver_(graph->GetArena(), this),
+        assembler_(graph->GetArena()),
         isa_features_(isa_features),
         constant_area_start_(0),
         method_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index cad94c7..3670ce2 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -948,13 +948,11 @@
     info.frame_size_in_bytes = method_header->GetFrameSizeInBytes();
     info.code_info = stack_map_size == 0 ? nullptr : stack_map_data;
     info.cfi = ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data());
-    ArrayRef<const uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
+    std::vector<uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
         GetCompilerDriver()->GetInstructionSet(),
         GetCompilerDriver()->GetInstructionSetFeatures(),
         ArrayRef<const debug::MethodDebugInfo>(&info, 1));
-    CreateJITCodeEntryForAddress(code_address,
-                                 std::unique_ptr<const uint8_t[]>(elf_file.data()),
-                                 elf_file.size());
+    CreateJITCodeEntryForAddress(code_address, std::move(elf_file));
   }
 
   Runtime::Current()->GetJit()->AddMemoryUsage(method, arena.BytesUsed());