Adds support for collecting statistics about code and its metadata.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0bce56c402ab7de3f98b3cf605e86f7524676a0c..3bc6ef9330e0677808a40c7f82bcab4e22bebb55 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4448,6 +4448,10 @@ class BytecodeArray : public FixedArrayBase {
 
   inline int instruction_size();
 
+  // Returns the size of bytecode and its metadata. This includes the size of
+  // bytecode, constant pool, source position table, and handler table.
+  inline int SizeIncludingMetadata();
+
   int SourcePosition(int offset);
   int SourceStatementPosition(int offset);
 
@@ -5125,6 +5129,10 @@ class Code: public HeapObject {
   // Returns the size of the instructions, padding, and relocation information.
   inline int body_size();
 
+  // Returns the size of code and its metadata. This includes the size of code
+  // relocation information, deoptimization data and handler table.
+  inline int SizeIncludingMetadata();
+
   // Returns the address of the first relocation info (read backwards!).
   inline byte* relocation_start();
 
@@ -5356,8 +5364,11 @@ class AbstractCode : public HeapObject {
     CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM)
 #undef DEFINE_CODE_KIND_ENUM
         INTERPRETED_FUNCTION,
+    NUMBER_OF_KINDS
   };
 
+  static const char* Kind2String(Kind kind);
+
   int SourcePosition(int offset);
   int SourceStatementPosition(int offset);
 
@@ -5367,9 +5378,12 @@ class AbstractCode : public HeapObject {
   // Returns the address right after the last instruction.
   inline Address instruction_end();
 
-  // Returns the of the code instructions.
+  // Returns the size of the code instructions.
   inline int instruction_size();
 
+  // Returns the size of instructions and the metadata.
+  inline int SizeIncludingMetadata();
+
   // Returns true if pc is inside this object's instructions.
   inline bool contains(byte* pc);