Make sure the constant pool size is as promised.

src/disassembler.cc

Index: src/disassembler.cc
diff --git a/src/disassembler.cc b/src/disassembler.cc
index 9ec2f42377ba7de4b2f090d5855811ce1641ac12..47e506d1127ef03adc42f26ceb647ced2061c4a2 100644
--- a/src/disassembler.cc
+++ b/src/disassembler.cc
@@ -100,8 +100,8 @@ static int DecodeIt(Isolate* isolate, std::ostream* os,
       int num_const = d.ConstantPoolSizeAt(pc);
       if (num_const >= 0) {
         SNPrintF(decode_buffer,
-                 "%08x       constant pool begin",
-                 *reinterpret_cast<int32_t*>(pc));
+                 "%08x       constant pool begin (num_const = %d)",
+                 *reinterpret_cast<int32_t*>(pc), num_const);
         constants = num_const;
         pc += 4;
       } else if (it != NULL && !it->done() && it->rinfo()->pc() == pc &&