[turbofan] Simplify graph assembler label.

Now we create merges, effect phis and phis eagerly. This should make it
easier to add loop support in future.

Bug: v8:5267
Change-Id: I5324aec323feff581f5b34235a0b3d3b8987127c
Reviewed-on: https://chromium-review.googlesource.com/637834
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47651}

src/compiler/graph-assembler.cc

@@ -186,9 +186,8 @@ Node* GraphAssembler::DeoptimizeUnless(DeoptimizeReason reason, Node* condition,
                           frame_state);
 }
 
-void GraphAssembler::Branch(Node* condition,
-                            GraphAssemblerStaticLabel<1>* if_true,
-                            GraphAssemblerStaticLabel<1>* if_false) {
+void GraphAssembler::Branch(Node* condition, GraphAssemblerLabel<0u>* if_true,
+                            GraphAssemblerLabel<0u>* if_false) {
   DCHECK_NOT_NULL(current_control_);
 
   BranchHint hint = BranchHint::kNone;
@@ -240,66 +239,6 @@ Operator const* GraphAssembler::ToNumberOperator() {
   return to_number_operator_.get();
 }
 
-Node* GraphAssemblerLabel::PhiAt(size_t index) {
-  DCHECK(IsBound());
-  return GetBindingsPtrFor(index)[0];
-}
-
-GraphAssemblerLabel::GraphAssemblerLabel(GraphAssemblerLabelType is_deferred,
-                                         size_t merge_count, size_t var_count,
-                                         MachineRepresentation* representations,
-                                         Zone* zone)
-    : is_deferred_(is_deferred == GraphAssemblerLabelType::kDeferred),
-      max_merge_count_(merge_count),
-      var_count_(var_count) {
-  effects_ = zone->NewArray<Node*>(MaxMergeCount() + 1);
-  for (size_t i = 0; i < MaxMergeCount() + 1; i++) {
-    effects_[i] = nullptr;
-  }
-
-  controls_ = zone->NewArray<Node*>(MaxMergeCount());
-  for (size_t i = 0; i < MaxMergeCount(); i++) {
-    controls_[i] = nullptr;
-  }
-
-  size_t num_bindings = (MaxMergeCount() + 1) * PhiCount() + 1;
-  bindings_ = zone->NewArray<Node*>(num_bindings);
-  for (size_t i = 0; i < num_bindings; i++) {
-    bindings_[i] = nullptr;
-  }
-
-  representations_ = zone->NewArray<MachineRepresentation>(PhiCount() + 1);
-  for (size_t i = 0; i < PhiCount(); i++) {
-    representations_[i] = representations[i];
-  }
-}
-
-GraphAssemblerLabel::~GraphAssemblerLabel() {
-  DCHECK(IsBound() || MergedCount() == 0);
-}
-
-Node** GraphAssemblerLabel::GetBindingsPtrFor(size_t phi_index) {
-  DCHECK_LT(phi_index, PhiCount());
-  return &bindings_[phi_index * (MaxMergeCount() + 1)];
-}
-
-void GraphAssemblerLabel::SetBinding(size_t phi_index, size_t merge_index,
-                                     Node* binding) {
-  DCHECK_LT(phi_index, PhiCount());
-  DCHECK_LT(merge_index, MaxMergeCount());
-  bindings_[phi_index * (MaxMergeCount() + 1) + merge_index] = binding;
-}
-
-MachineRepresentation GraphAssemblerLabel::GetRepresentationFor(
-    size_t phi_index) {
-  DCHECK_LT(phi_index, PhiCount());
-  return representations_[phi_index];
-}
-
-Node** GraphAssemblerLabel::GetControlsPtr() { return controls_; }
-
-Node** GraphAssemblerLabel::GetEffectsPtr() { return effects_; }
-
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8