Simplify feedback vector creation and store in SharedFunctionInfo.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index b76af2465a03f4f5bbe8980be3903cb5fb9febd7..e21eddc4ec7edee579f0af4ded64e245ce41c912 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -156,8 +156,6 @@ void FullCodeGenerator::Generate() {
   handler_table_ =
       isolate()->factory()->NewFixedArray(function()->handler_count(), TENURED);
 
-  InitializeFeedbackVector();
-
   profiling_counter_ = isolate()->factory()->NewCell(
       Handle<Smi>(Smi::FromInt(FLAG_interrupt_budget), isolate()));
   SetFunctionPosition(function());
@@ -1193,12 +1191,8 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   Label non_proxy;
   __ bind(&fixed_array);
 
-  Handle<Object> feedback = Handle<Object>(
-      Smi::FromInt(TypeFeedbackInfo::kForInFastCaseMarker),
-      isolate());
-  StoreFeedbackVectorSlot(slot, feedback);
   __ Move(r1, FeedbackVector());
-  __ mov(r2, Operand(Smi::FromInt(TypeFeedbackInfo::kForInSlowCaseMarker)));
+  __ mov(r2, Operand(TypeFeedbackInfo::MegamorphicSentinel(isolate())));
   __ str(r2, FieldMemOperand(r1, FixedArray::OffsetOfElementAt(slot)));
 
   __ mov(r1, Operand(Smi::FromInt(1)));  // Smi indicates slow check
@@ -2721,9 +2715,6 @@ void FullCodeGenerator::EmitCallWithStub(Call* expr) {
   // Record source position for debugger.
   SetSourcePosition(expr->position());
 
-  Handle<Object> uninitialized =
-      TypeFeedbackInfo::UninitializedSentinel(isolate());
-  StoreFeedbackVectorSlot(expr->CallFeedbackSlot(), uninitialized);
   __ Move(r2, FeedbackVector());
   __ mov(r3, Operand(Smi::FromInt(expr->CallFeedbackSlot())));
 
@@ -2910,12 +2901,8 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code.
-  Handle<Object> uninitialized =
-      TypeFeedbackInfo::UninitializedSentinel(isolate());
-  StoreFeedbackVectorSlot(expr->CallNewFeedbackSlot(), uninitialized);
   if (FLAG_pretenuring_call_new) {
-    StoreFeedbackVectorSlot(expr->AllocationSiteFeedbackSlot(),
-                            isolate()->factory()->NewAllocationSite());
+    EnsureSlotContainsAllocationSite(expr->AllocationSiteFeedbackSlot());
     ASSERT(expr->AllocationSiteFeedbackSlot() ==
            expr->CallNewFeedbackSlot() + 1);
   }