[heap] Introduce enum of garbage collection reasons.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 7f8f9ab1ca6affa801a2e9756ac3593bfa713a90..5bd5cfa1affdc7b83b8e84f43431185eae1785fb 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -18125,7 +18125,8 @@ Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
     if (capacity > ObjectHashTable::kMaxCapacity) {
       for (size_t i = 0; i < 2; ++i) {
         isolate->heap()->CollectAllGarbage(
-            Heap::kFinalizeIncrementalMarkingMask, "full object hash table");
+            Heap::kFinalizeIncrementalMarkingMask,
+            GarbageCollectionReason::kFullHashtable);
       }
       table->Rehash(isolate->factory()->undefined_value());
     }