Move a bunch of GC related files to heap/ subdirectory

src/v8.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 //
 // Top include for all V8 .cc files.
 //
 
 #ifndef V8_V8_H_
 #define V8_V8_H_
@@ skipping 19 matching lines @@
 #include "include/v8-platform.h"
 #include "src/checks.h"  // NOLINT
 #include "src/allocation.h"  // NOLINT
 #include "src/assert-scope.h"  // NOLINT
 #include "src/utils.h"  // NOLINT
 #include "src/flags.h"  // NOLINT
 #include "src/globals.h"  // NOLINT
 
 // Objects & heap
 #include "src/objects-inl.h"  // NOLINT
-#include "src/spaces-inl.h"  // NOLINT
-#include "src/heap-inl.h"  // NOLINT
-#include "src/incremental-marking-inl.h"  // NOLINT
-#include "src/mark-compact-inl.h"  // NOLINT
+#include "src/heap/spaces-inl.h"               // NOLINT
+#include "src/heap/heap-inl.h"                 // NOLINT
+#include "src/heap/incremental-marking-inl.h"  // NOLINT
+#include "src/heap/mark-compact-inl.h"         // NOLINT
 #include "src/log-inl.h"  // NOLINT
 #include "src/handles-inl.h"  // NOLINT
 #include "src/types-inl.h"  // NOLINT
 #include "src/zone-inl.h"  // NOLINT
 
 namespace v8 {
 namespace internal {
 
 class Deserializer;
 
@@ skipping 45 matching lines @@
 };
 
 
 // JavaScript defines two kinds of 'nil'.
 enum NilValue { kNullValue, kUndefinedValue };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_H_