Merge experimental/a64 to bleeding_edge.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 02ec66da2c7727021b84dca8a252b7c626043abb..8f3247f5ce00376e331d2bad596d56ca2252730b 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1580,6 +1580,7 @@ Isolate::Isolate()
   thread_manager_->isolate_ = this;
 
 #if V8_TARGET_ARCH_ARM && !defined(__arm__) || \
+    V8_TARGET_ARCH_A64 && !defined(__aarch64__) || \
     V8_TARGET_ARCH_MIPS && !defined(__mips__)
   simulator_initialized_ = false;
   simulator_i_cache_ = NULL;
@@ -1965,7 +1966,7 @@ bool Isolate::Init(Deserializer* des) {
 
   // Initialize other runtime facilities
 #if defined(USE_SIMULATOR)
-#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_A64 || V8_TARGET_ARCH_MIPS
   Simulator::Initialize(this);
 #endif
 #endif