Begins work on ARM64, first assembler test.

runtime/vm/elfgen.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ELFGEN_H_
 #define VM_ELFGEN_H_
 
 #include "vm/thread.h"
 
 namespace dart {
@@ skipping 385 matching lines @@
   WriteByte(&header_, 0);  // EI_PAD
   WriteInt(&header_, 0);  // EI_PAD
   WriteInt(&header_, 0);  // EI_PAD
   WriteShort(&header_, kET_DYN);  // e_type, fake a shared object.
 #if defined(TARGET_ARCH_IA32)
   WriteShort(&header_, kEM_386);  // e_machine
 #elif defined(TARGET_ARCH_X64)
   WriteShort(&header_, kEM_X86_64);  // e_machine
 #elif defined(TARGET_ARCH_ARM)
   WriteShort(&header_, kEM_ARM);  // e_machine
+#elif defined(TARGET_ARCH_ARM64)
+  // TODO(zra): Find the right ARM64 constant.
+  WriteShort(&header_, kEM_ARM);  // e_machine
 #elif defined(TARGET_ARCH_MIPS)
   WriteShort(&header_, kEM_MIPS);  // e_machine
 #else
 #error Unknown architecture.
 #endif
   WriteInt(&header_, kEV_CURRENT);  // e_version
   WriteWord(&header_, 0);  // e_entry: none
   WriteWord(&header_, 0);  // e_phoff: no program header table.
   WriteWord(&header_, shoff);  // e_shoff: section header table offset.
   WriteInt(&header_, 0);  // e_flags: no flags.
@@ skipping 80 matching lines @@
   ASSERT(offset == shoff);
   offset += (*writer)(handle, sheaders_);
   ASSERT(offset == shoff + kNumSections * kSectionHeaderEntrySize);
 
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_ELFGEN_H_