[Interpreter] Add BytecodeArray class and add to SharedFunctionInfo.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 769f53ff58267d2a87e63381cd7604cde0cf055f..297488caba3ff58406facbbe1d1a44449e160f81 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -198,7 +198,10 @@ namespace internal {
   V(Object, weak_stack_trace_list, WeakStackTraceList)                         \
   V(Object, code_stub_context, CodeStubContext)                                \
   V(JSObject, code_stub_exports_object, CodeStubExportsObject)                 \
-  V(FixedArray, interpreter_table, InterpreterTable)
+  V(FixedArray, interpreter_table, InterpreterTable)                           \
+  V(Map, bytecode_array_map, BytecodeArrayMap)                                 \
+  V(BytecodeArray, empty_bytecode_array, EmptyBytecodeArray)
+
 
 // Entries in this list are limited to Smis and are not visited during GC.
 #define SMI_ROOT_LIST(V)                                                   \
@@ -336,6 +339,7 @@ namespace internal {
 // skip write barriers. This list is not complete and has omissions.
 #define IMMORTAL_IMMOVABLE_ROOT_LIST(V) \
   V(ByteArrayMap)                       \
+  V(BytecodeArrayMap)                   \
   V(FreeSpaceMap)                       \
   V(OnePointerFillerMap)                \
   V(TwoPointerFillerMap)                \
@@ -364,6 +368,7 @@ namespace internal {
   V(OrderedHashTableMap)                \
   V(EmptyFixedArray)                    \
   V(EmptyByteArray)                     \
+  V(EmptyBytecodeArray)                 \
   V(EmptyDescriptorArray)               \
   V(ArgumentsMarker)                    \
   V(SymbolMap)                          \
@@ -1673,6 +1678,10 @@ class Heap {
   MUST_USE_RESULT AllocationResult
       AllocateByteArray(int length, PretenureFlag pretenure = NOT_TENURED);
 
+  // Allocates a bytecode array with given contents.
+  MUST_USE_RESULT AllocationResult
+      AllocateBytecodeArray(int length, const byte* raw_bytecodes);
+
   // Copy the code and scope info part of the code object, but insert
   // the provided data as the relocation information.
   MUST_USE_RESULT AllocationResult