WIP SharedArrayBuffer implementation

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index d6cbc1444ad52eac67ab0f98ecd35f3a8e3943ae..fc3a91b948017bf4d6dd837cb0766cb09db38e81 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6072,7 +6072,8 @@ bool HOptimizedGraphBuilder::PropertyAccessInfo::LookupInPrototypes() {
 
 bool HOptimizedGraphBuilder::PropertyAccessInfo::IsIntegerIndexedExotic() {
   InstanceType instance_type = map_->instance_type();
-  return instance_type == JS_TYPED_ARRAY_TYPE &&
+  return (instance_type == JS_TYPED_ARRAY_TYPE ||
+          instance_type == JS_SHARED_TYPED_ARRAY_TYPE) &&
          IsSpecialIndex(isolate()->unicode_cache(), *name_);
 }
 
@@ -9721,7 +9722,8 @@ void HOptimizedGraphBuilder::GenerateTypedArrayInitialize(
   static const int kBufferArg = 2;
   static const int kByteOffsetArg = 3;
   static const int kByteLengthArg = 4;
-  static const int kArgsLength = 5;
+  static const int kIsSharedArg = 5;
+  static const int kArgsLength = 6;
   DCHECK(arguments->length() == kArgsLength);
 
 
@@ -9770,6 +9772,9 @@ void HOptimizedGraphBuilder::GenerateTypedArrayInitialize(
   CHECK_ALIVE(VisitForValue(arguments->at(kByteLengthArg)));
   HValue* byte_length = Pop();
 
+  CHECK_ALIVE(VisitForValue(arguments->at(kIsSharedArg)));
+  HValue* is_shared = Pop();
+
   NoObservableSideEffectsScope scope(this);
   IfBuilder byte_offset_smi(this);
 
@@ -9804,6 +9809,9 @@ void HOptimizedGraphBuilder::GenerateTypedArrayInitialize(
         HObjectAccess::ForJSTypedArrayLength(),
         length);
 
+    Add<HStoreNamedField>(obj, HObjectAccess::ForJSTypedArrayIsShared(),
+                          is_shared);
+
     HValue* elements;
     if (buffer != NULL) {
       elements = BuildAllocateExternalElements(