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

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index 1b3e91c7037ff5df8f68c471521c03a0af8c841d..9f1b479741142c8c2c5acb45aacd19f77bde3c39 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -94,11 +94,16 @@
         'gay-fixed.cc',
         'gay-precision.cc',
         'gay-shortest.cc',
-        'heap-tester.h',
+        'heap/heap-tester.h',
+        'heap/test-alloc.cc',
+        'heap/test-heap.cc',
+        'heap/test-incremental-marking.cc',
+        'heap/test-mark-compact.cc',
+        'heap/test-spaces.cc',
+        'heap/utils-inl.h',
         'print-extension.cc',
         'profiler-extension.cc',
         'test-accessors.cc',
-        'test-alloc.cc',
         'test-api.cc',
         'test-api.h',
         # TODO(epertoso): re-enable the following test after the API change is
@@ -138,18 +143,15 @@
         'test-global-object.cc',
         'test-hashing.cc',
         'test-hashmap.cc',
-        'test-heap.cc',
         'test-heap-profiler.cc',
         'test-hydrogen-types.cc',
         'test-identity-map.cc',
-        'test-incremental-marking.cc',
         'test-inobject-slack-tracking.cc',
         'test-list.cc',
         'test-liveedit.cc',
         'test-lockers.cc',
         'test-log.cc',
         'test-microtask-delivery.cc',
-        'test-mark-compact.cc',
         'test-mementos.cc',
         'test-object-observe.cc',
         'test-parsing.cc',
@@ -163,7 +165,6 @@
         'test-serialize.cc',
         'test-simd.cc',
         'test-slots-buffer.cc',
-        'test-spaces.cc',
         'test-strings.cc',
         'test-symbols.cc',
         'test-strtod.cc',