Fix another gcc 4.9.2 sign-compare error.

BUG=

Review URL: https://codereview.chromium.org/1370353003

Cr-Commit-Position: refs/heads/master@{#31063}

src/interpreter/bytecode-array-builder.cc

@@ -77,7 +77,7 @@ Handle<BytecodeArray> BytecodeArrayBuilder::ToBytecodeArray() {
 
 template <size_t N>
 void BytecodeArrayBuilder::Output(Bytecode bytecode, uint32_t(&operands)[N]) {
-  DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), N);
+  DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), static_cast<int>(N));
   last_bytecode_start_ = bytecodes()->size();
   bytecodes()->push_back(Bytecodes::ToByte(bytecode));
   for (int i = 0; i < static_cast<int>(N); i++) {