[Interpreter] Add support for for..in.

src/compiler/interpreter-assembler.cc

Index: src/compiler/interpreter-assembler.cc
diff --git a/src/compiler/interpreter-assembler.cc b/src/compiler/interpreter-assembler.cc
index 512bfb69e1fb5793646d83fc7587b0d80fe05cbe..9eb792e2a63b8d6dcca506bd421edab830a4c727 100644
--- a/src/compiler/interpreter-assembler.cc
+++ b/src/compiler/interpreter-assembler.cc
@@ -291,6 +291,15 @@ Node* InterpreterAssembler::LoadConstantPoolEntry(Node* index) {
 }
 
 
+Node* InterpreterAssembler::LoadFixedArrayElement(Node* fixed_array,

[rmcilroy, 2015/10/26 14:04:01]

nit - please add a test for this in interpreter-assembler-unittests.cc

[oth, 2015/10/28 11:53:11]

Done.

+                                                  int index) {
+  Node* entry_offset =
+      IntPtrAdd(IntPtrConstant(FixedArray::kHeaderSize - kHeapObjectTag),
+                WordShl(Int32Constant(index), kPointerSizeLog2));
+  return raw_assembler_->Load(kMachAnyTagged, fixed_array, entry_offset);
+}
+
+
 Node* InterpreterAssembler::LoadObjectField(Node* object, int offset) {
   return raw_assembler_->Load(kMachAnyTagged, object,
                               IntPtrConstant(offset - kHeapObjectTag));