[interpreter] Remove OperandScale from front stages of pipeline.

src/interpreter/bytecode-array-writer.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_INTERPRETER_BYTECODE_ARRAY_WRITER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_
 
 #include "src/interpreter/bytecode-pipeline.h"
 #include "src/interpreter/source-position-table.h"
 
@@ skipping 16 matching lines @@
   // BytecodePipelineStage interface.
   void Write(BytecodeNode* node) override;
   void WriteJump(BytecodeNode* node, BytecodeLabel* label) override;
   void BindLabel(BytecodeLabel* label) override;
   void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override;
   Handle<BytecodeArray> ToBytecodeArray(
       int fixed_register_count, int parameter_count,
       Handle<FixedArray> handler_table) override;
 
  private:
+  // Constants that act as placeholders for jump operands to be
+  // patched. These have operand sizes that match the sizes of
+  // reserved constant pool entries.
+  static const uint32_t k8BitPlaceholder = 0x7f;

[rmcilroy, 2016/06/07 10:32:46]

kJump8BitPlaceholder (and similar)

[oth, 2016/06/08 15:08:41]

Done.

+  static const uint32_t k16BitPlaceholder =
+      k8BitPlaceholder | (k8BitPlaceholder << 8);
+  static const uint32_t k32BitPlaceholder =
+      k16BitPlaceholder | (k16BitPlaceholder << 16);
+
   void PatchJump(size_t jump_target, size_t jump_location);
   void PatchJumpWith8BitOperand(size_t jump_location, int delta);
   void PatchJumpWith16BitOperand(size_t jump_location, int delta);
   void PatchJumpWith32BitOperand(size_t jump_location, int delta);
 
   void EmitBytecode(const BytecodeNode* const node);
   void EmitJump(BytecodeNode* node, BytecodeLabel* label);
   void UpdateSourcePositionTable(const BytecodeNode* const node);
 
   Isolate* isolate() { return isolate_; }
@@ skipping 15 matching lines @@
 
   friend class BytecodeArrayWriterUnittest;
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_