Initial patch for a64.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 0ea7ac96b59b29e563ce4e95267ffdbb593ecadd..09228164a04094ef1b534a3a9947d6b6296e1c4d 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -95,13 +95,19 @@ namespace internal {
   V(KeyedLoadField)
 
 // List of code stubs only used on ARM platforms.
-#ifdef V8_TARGET_ARCH_ARM
+#if defined(V8_TARGET_ARCH_ARM)
 #define CODE_STUB_LIST_ARM(V)  \
   V(GetProperty)               \
   V(SetProperty)               \
   V(InvokeBuiltin)             \
   V(RegExpCEntry)              \
   V(DirectCEntry)
+#elif defined(V8_TARGET_ARCH_A64)
+#define CODE_STUB_LIST_ARM(V)  \
+  V(GetProperty)               \
+  V(SetProperty)               \
+  V(InvokeBuiltin)             \
+  V(DirectCEntry)
 #else
 #define CODE_STUB_LIST_ARM(V)
 #endif
@@ -390,6 +396,8 @@ class RuntimeCallHelper {
 #include "ia32/code-stubs-ia32.h"
 #elif V8_TARGET_ARCH_X64
 #include "x64/code-stubs-x64.h"
+#elif V8_TARGET_ARCH_A64
+#include "a64/code-stubs-a64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/code-stubs-arm.h"
 #elif V8_TARGET_ARCH_MIPS