[turbofan] Sparse representation for state values

src/compiler/js-create-lowering.cc

Index: src/compiler/js-create-lowering.cc
diff --git a/src/compiler/js-create-lowering.cc b/src/compiler/js-create-lowering.cc
index 102e5a9b97461326294810c6d9556122c54cf4fd..3438066b866a7d7d761bf90ecd58577bc66d8c7c 100644
--- a/src/compiler/js-create-lowering.cc
+++ b/src/compiler/js-create-lowering.cc
@@ -929,6 +929,7 @@ Node* JSCreateLowering::AllocateArguments(Node* effect, Node* control,
   AllocationBuilder a(jsgraph(), effect, control);
   a.AllocateArray(argument_count, factory()->fixed_array_map());
   for (int i = 0; i < argument_count; ++i, ++parameters_it) {
+    DCHECK_NOT_NULL((*parameters_it).node);
     a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
   }
   return a.Finish();
@@ -958,6 +959,7 @@ Node* JSCreateLowering::AllocateRestArguments(Node* effect, Node* control,
   AllocationBuilder a(jsgraph(), effect, control);
   a.AllocateArray(num_elements, factory()->fixed_array_map());
   for (int i = 0; i < num_elements; ++i, ++parameters_it) {
+    DCHECK_NOT_NULL((*parameters_it).node);
     a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
   }
   return a.Finish();
@@ -987,18 +989,19 @@ Node* JSCreateLowering::AllocateAliasedArguments(
   // Prepare an iterator over argument values recorded in the frame state.
   Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
   StateValuesAccess parameters_access(parameters);
-  auto paratemers_it = ++parameters_access.begin();
+  auto parameters_it = ++parameters_access.begin();
 
   // The unmapped argument values recorded in the frame state are stored yet
   // another indirection away and then linked into the parameter map below,
   // whereas mapped argument values are replaced with a hole instead.
   AllocationBuilder aa(jsgraph(), effect, control);
   aa.AllocateArray(argument_count, factory()->fixed_array_map());
-  for (int i = 0; i < mapped_count; ++i, ++paratemers_it) {
+  for (int i = 0; i < mapped_count; ++i, ++parameters_it) {
     aa.Store(AccessBuilder::ForFixedArraySlot(i), jsgraph()->TheHoleConstant());
   }
-  for (int i = mapped_count; i < argument_count; ++i, ++paratemers_it) {
-    aa.Store(AccessBuilder::ForFixedArraySlot(i), (*paratemers_it).node);
+  for (int i = mapped_count; i < argument_count; ++i, ++parameters_it) {
+    DCHECK_NOT_NULL((*parameters_it).node);
+    aa.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
   }
   Node* arguments = aa.Finish();