[interpreter] Streamline bytecode array writing.

src/interpreter/bytecode-array-writer.h

Index: src/interpreter/bytecode-array-writer.h
diff --git a/src/interpreter/bytecode-array-writer.h b/src/interpreter/bytecode-array-writer.h
index 76d881ed58be4835df8372ec9e516278875d22dc..9c7dfd1c2fb7361ceab61b5524fdfbcfda218d43 100644
--- a/src/interpreter/bytecode-array-writer.h
+++ b/src/interpreter/bytecode-array-writer.h
@@ -34,6 +34,12 @@ class BytecodeArrayWriter final : public BytecodePipelineStage {
       Handle<FixedArray> handler_table) override;
 
  private:
+  // Maximum sized packed bytecode is comprised of a prefix bytecode,
+  // plus the actual bytecode, plus the maximum number of operands times
+  // the maximum operand size.
+  static const size_t kMaxSizeOfPackedBytecode =
+      2 * sizeof(Bytecode) + Bytecodes::kMaxOperands * sizeof(uint32_t);

[rmcilroy, 2016/06/27 14:03:48]

/s/uint32_t/OperandSize::kLast ?

[oth, 2016/06/27 18:53:50]

Done.

+
   // Constants that act as placeholders for jump operands to be
   // patched. These have operand sizes that match the sizes of
   // reserved constant pool entries.