[interpreter] Fix memory leak in Bytecodes::Decode().

src/interpreter/bytecodes.cc

Index: src/interpreter/bytecodes.cc
diff --git a/src/interpreter/bytecodes.cc b/src/interpreter/bytecodes.cc
index ac793dab6a60099e55295c611814c3978a6aab3a..758a44dd44d0f64f9ce38fa732b9820da790a82f 100644
--- a/src/interpreter/bytecodes.cc
+++ b/src/interpreter/bytecodes.cc
@@ -484,7 +484,7 @@ uint32_t Bytecodes::DecodeUnsignedOperand(const uint8_t* operand_start,
 // static
 std::ostream& Bytecodes::Decode(std::ostream& os, const uint8_t* bytecode_start,
                                 int parameter_count) {
-  Vector<char> buf = Vector<char>::New(50);
+  ScopedVector<char> buf(50);
 
   Bytecode bytecode = Bytecodes::FromByte(bytecode_start[0]);
   int prefix_offset = 0;