[turbofan] Add FixedArray peephole optimizations to CodeStubAssembler

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 72a8a7ee8b598e859229fe4da1a9fd4b05e8b169..a42da50f8312ddcf9a226ffc006f32be8a345171 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -1720,7 +1720,8 @@ void Interpreter::DoForInNext(InterpreterAssembler* assembler) {
   Node* cache_array = __ LoadRegister(cache_array_reg);
 
   // Load the next key from the enumeration array.
-  Node* key = __ LoadFixedArrayElementSmiIndex(cache_array, index);
+  Node* key = __ LoadFixedArrayElement(cache_array, index, 0,
+                                       CodeStubAssembler::SMI_PARAMETERS);
 
   // Check if we can use the for-in fast path potentially using the enum cache.
   Label if_fast(assembler), if_slow(assembler, Label::kDeferred);
@@ -1740,8 +1741,8 @@ void Interpreter::DoForInNext(InterpreterAssembler* assembler) {
     Node* type_feedback_vector = __ LoadTypeFeedbackVector();
     Node* megamorphic_sentinel =
         __ HeapConstant(TypeFeedbackVector::MegamorphicSentinel(isolate_));
-    __ StoreFixedArrayElementNoWriteBarrier(type_feedback_vector, vector_index,
-                                            megamorphic_sentinel);
+    __ StoreFixedArrayElement(type_feedback_vector, vector_index,
+                              megamorphic_sentinel, SKIP_WRITE_BARRIER);
 
     // Need to filter the {key} for the {receiver}.
     Node* context = __ GetContext();