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

src/compiler/bytecode-graph-builder.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_
 #define V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/bytecode-loop-analysis.h"
 #include "src/compiler/js-graph.h"
@@ skipping 117 matching lines @@
   // to the given node and the output value produced by the node is combined.
   // Conceptually this frame state is "after" a given operation.
   void PrepareFrameState(Node* node, OutputFrameStateCombine combine);
 
   // Computes register liveness and replaces dead ones in frame states with the
   // undefined values.
   void ClearNonLiveSlotsInFrameStates();
 
   void BuildCreateArguments(CreateArgumentsType type);
   Node* BuildLoadContextSlot();
+  Node* BuildLoadCurrentContextSlot();
   Node* BuildLoadGlobal(uint32_t feedback_slot_index, TypeofMode typeof_mode);
   void BuildStoreGlobal(LanguageMode language_mode);
   Node* BuildNamedLoad();
   void BuildNamedStore(LanguageMode language_mode);
   Node* BuildKeyedLoad();
   void BuildKeyedStore(LanguageMode language_mode);
   void BuildLdaLookupSlot(TypeofMode typeof_mode);
   void BuildLdaLookupContextSlot(TypeofMode typeof_mode);
   void BuildLdaLookupGlobalSlot(TypeofMode typeof_mode);
   void BuildStaLookupSlot(LanguageMode language_mode);
@@ skipping 177 matching lines @@
   static int const kBinaryOperationSmiHintIndex = 2;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeGraphBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_BYTECODE_GRAPH_BUILDER_H_