[cctest] Move most heap related tests to test/cctest/heap and clean wrt IWYU

test/cctest/heap/heap-tester.h

 // Copyright 2015 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 HEAP_TESTER_H_
-#define HEAP_TESTER_H_
+#ifndef HEAP_HEAP_TESTER_H_
+#define HEAP_HEAP_TESTER_H_
 
 #include "src/handles.h"
 #include "src/heap/spaces.h"
 
 // Tests that should have access to private methods of {v8::internal::Heap}.
 // Those tests need to be defined using HEAP_TEST(Name) { ... }.
 #define HEAP_TEST_METHODS(V)            \
   V(CompactionSpaceDivideMultiplePages) \
   V(CompactionSpaceDivideSinglePage)    \
   V(GCFlags)                            \
@@ skipping 55 matching lines @@
                               intptr_t* capacity, intptr_t* size);
   static void TestCompactionSpaceDivide(int num_additional_objects,
                                         int object_size,
                                         int num_compaction_spaces,
                                         int additional_capacity_in_bytes);
 };
 
 }  // namespace internal
 }  // namespace v8
 
-#endif  // HEAP_TESTER_H_
+#endif  // HEAP_HEAP_TESTER_H_