Initial patch for a64.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 76a5a41e70ab0b32502d10a5c9ed37ad22789985..e95efbb997760a9642eef5f404b3be06b959b3e7 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -101,7 +101,8 @@ class Debugger;
 class DebuggerAgent;
 #endif
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_A64) || \
+    !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
     !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
 class Redirection;
 class Simulator;
@@ -263,7 +264,8 @@ class ThreadLocalTop BASE_EMBEDDED {
   Address handler_;   // try-blocks are chained through the stack
 
 #ifdef USE_SIMULATOR
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if defined(V8_TARGET_ARCH_A64) || defined(V8_TARGET_ARCH_ARM) || \
+    defined(V8_TARGET_ARCH_MIPS)
   Simulator* simulator_;
 #endif
 #endif  // USE_SIMULATOR
@@ -393,7 +395,8 @@ class Isolate {
           thread_id_(thread_id),
           stack_limit_(0),
           thread_state_(NULL),
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_A64) || \
+    !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
     !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
           simulator_(NULL),
 #endif
@@ -406,7 +409,8 @@ class Isolate {
     ThreadState* thread_state() const { return thread_state_; }
     void set_thread_state(ThreadState* value) { thread_state_ = value; }
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_A64) || \
+    !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
     !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
     Simulator* simulator() const { return simulator_; }
     void set_simulator(Simulator* simulator) {
@@ -424,7 +428,8 @@ class Isolate {
     uintptr_t stack_limit_;
     ThreadState* thread_state_;
 
-#if !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
+#if !defined(__arm__) && defined(V8_TARGET_ARCH_A64) || \
+    !defined(__arm__) && defined(V8_TARGET_ARCH_ARM) || \
     !defined(__mips__) && defined(V8_TARGET_ARCH_MIPS)
     Simulator* simulator_;
 #endif
@@ -997,7 +1002,8 @@ class Isolate {
   int* code_kind_statistics() { return code_kind_statistics_; }
 #endif
 
-#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+#if defined(V8_TARGET_ARCH_A64) && !defined(__arm__) || \
+    defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
     defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized() { return simulator_initialized_; }
   void set_simulator_initialized(bool initialized) {
@@ -1295,7 +1301,8 @@ class Isolate {
   // Time stamp at initialization.
   double time_millis_at_init_;
 
-#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+#if defined(V8_TARGET_ARCH_A64) && !defined(__arm__) || \
+    defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
     defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized_;
   HashMap* simulator_i_cache_;