[elements] Precisely estimate elements size for large-object limits

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index e8d4a3a5d4ef307d9f3ef5bf065e76895c23c585..d059b108884af761357de7d2b642db1d08010b3c 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -31,6 +31,14 @@ class V8_EXPORT_PRIVATE Factory final {
   // Allocates a fixed array initialized with undefined values.
   Handle<FixedArray> NewFixedArray(int size,
                                    PretenureFlag pretenure = NOT_TENURED);
+  // Tries allocating a fixed array initialized with undefined values.
+  // In case of an allocation failure (OOM) an empty handle is returned.
+  // The caller has to manually signal an
+  // v8::internal::Heap::FatalProcessOutOfMemory typically by calling
+  // NewFixedArray as a fallback.
+  MUST_USE_RESULT
+  MaybeHandle<FixedArray> TryNewFixedArray(
+      int size, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new fixed array with non-existing entries (the hole).
   Handle<FixedArray> NewFixedArrayWithHoles(