Move a bunch of GC related files to heap/ subdirectory

src/json-parser.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.
 
 #ifndef V8_JSON_PARSER_H_
 #define V8_JSON_PARSER_H_
 
 #include "src/v8.h"
 
 #include "src/char-predicates-inl.h"
 #include "src/conversions.h"
+#include "src/heap/spaces-inl.h"
 #include "src/messages.h"
-#include "src/spaces-inl.h"
 #include "src/token.h"
 
 namespace v8 {
 namespace internal {
 
 // A simple json parser.
 template <bool seq_ascii>
 class JsonParser BASE_EMBEDDED {
  public:
   MUST_USE_RESULT static MaybeHandle<Object> Parse(Handle<String> source) {
@@ skipping 757 matching lines @@
 
   DCHECK_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_