[ignition] Add bytecodes for loads/stores in the current context

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 865de43e4b214cd2223885937f02fe8556058f2d..6f7b374a7599eae1e15008d684b5c0b6fd0f02af 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -809,16 +809,36 @@ Node* BytecodeGraphBuilder::BuildLoadContextSlot() {
   return NewNode(op, context);
 }
 
+Node* BytecodeGraphBuilder::BuildLoadCurrentContextSlot() {
+  // TODO(mythria): immutable flag is also set to false. This information is not
+  // available in bytecode array. update this code when the implementation
+  // changes.
+  const Operator* op = javascript()->LoadContext(
+      0, bytecode_iterator().GetIndexOperand(0), false);
+  Node* context = environment()->Context();
+  return NewNode(op, context);
+}
+
 void BytecodeGraphBuilder::VisitLdaContextSlot() {
   Node* node = BuildLoadContextSlot();
   environment()->BindAccumulator(node);
 }
 
+void BytecodeGraphBuilder::VisitLdaCurrentContextSlot() {
+  Node* node = BuildLoadCurrentContextSlot();
+  environment()->BindAccumulator(node);
+}
+
 void BytecodeGraphBuilder::VisitLdrContextSlot() {
   Node* node = BuildLoadContextSlot();
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(3), node);
 }
 
+void BytecodeGraphBuilder::VisitLdrCurrentContextSlot() {
+  Node* node = BuildLoadCurrentContextSlot();
+  environment()->BindRegister(bytecode_iterator().GetRegisterOperand(1), node);
+}
+
 void BytecodeGraphBuilder::VisitStaContextSlot() {
   const Operator* op = javascript()->StoreContext(
       bytecode_iterator().GetUnsignedImmediateOperand(2),
@@ -829,6 +849,14 @@ void BytecodeGraphBuilder::VisitStaContextSlot() {
   NewNode(op, context, value);
 }
 
+void BytecodeGraphBuilder::VisitStaCurrentContextSlot() {
+  const Operator* op =
+      javascript()->StoreContext(0, bytecode_iterator().GetIndexOperand(0));
+  Node* context = environment()->Context();
+  Node* value = environment()->LookupAccumulator();
+  NewNode(op, context, value);
+}
+
 void BytecodeGraphBuilder::BuildLdaLookupSlot(TypeofMode typeof_mode) {
   PrepareEagerCheckpoint();
   Node* name =