Preliminary code for block scopes and block contexts.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 4f4ef14ddfe297eccfd9e8bf1a6f28403480e6a0..04ffe10c2a548785e5b9f5064fbea5195adb9b2a 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -65,6 +65,7 @@ inline Heap* _inline_get_heap_();
   V(Map, heap_number_map, HeapNumberMap)                                       \
   V(Map, global_context_map, GlobalContextMap)                                 \
   V(Map, fixed_array_map, FixedArrayMap)                                       \
+  V(Map, serialized_scope_info_map, SerializedScopeInfoMap)                    \
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Object, no_interceptor_result_sentinel, NoInterceptorResultSentinel)       \
@@ -111,6 +112,7 @@ inline Heap* _inline_get_heap_();
   V(Map, function_context_map, FunctionContextMap)                             \
   V(Map, catch_context_map, CatchContextMap)                                   \
   V(Map, with_context_map, WithContextMap)                                     \
+  V(Map, block_context_map, BlockContextMap)                                   \
   V(Map, code_map, CodeMap)                                                    \
   V(Map, oddball_map, OddballMap)                                              \
   V(Map, global_property_cell_map, GlobalPropertyCellMap)                      \
@@ -220,7 +222,8 @@ inline Heap* _inline_get_heap_();
   V(closure_symbol, "(closure)")                                         \
   V(use_strict, "use strict")                                            \
   V(dot_symbol, ".")                                                     \
-  V(anonymous_function_symbol, "(anonymous function)")
+  V(anonymous_function_symbol, "(anonymous function)")                   \
+  V(block_scope_symbol, ".block")
 
 // Forward declarations.
 class GCTracer;
@@ -483,6 +486,9 @@ class Heap {
   // Allocates an empty code cache.
   MUST_USE_RESULT MaybeObject* AllocateCodeCache();
 
+  // Allocates a serialized scope info.
+  MUST_USE_RESULT MaybeObject* AllocateSerializedScopeInfo(int length);
+
   // Allocates an empty PolymorphicCodeCache.
   MUST_USE_RESULT MaybeObject* AllocatePolymorphicCodeCache();
 
@@ -668,6 +674,11 @@ class Heap {
                                                    Context* previous,
                                                    JSObject* extension);
 
+  // Allocate a block context.
+  MUST_USE_RESULT MaybeObject* AllocateBlockContext(JSFunction* function,
+                                                    Context* previous,
+                                                    SerializedScopeInfo* info);
+
   // Allocates a new utility object in the old generation.
   MUST_USE_RESULT MaybeObject* AllocateStruct(InstanceType type);