[builtins] Make Array constructor consistent with other code

Make ArrayBuiltinsAssembler::GenerateConstructor use the
JSArray::kInitialMaxFastElementArray constant instead of trying to
manually compute it and end up with a different result depending on the
build. This brings the code in sync with CodeStubAssembler::CreateArray
and with Turbofan's JSCallReducer.

Change-Id: I7fcc955166484a91f8982b359b94d9a586fdb50a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2312780
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68995}

src/builtins/builtins-array-gen.cc

@@ -1852,13 +1852,8 @@ void ArrayBuiltinsAssembler::GenerateConstructor(
           SmiConstant(AbortReason::kAllocatingNonEmptyPackedArray);
       TailCallRuntime(Runtime::kAbort, context, reason);
     } else {
-      int element_size =
-          IsDoubleElementsKind(elements_kind) ? kDoubleSize : kTaggedSize;
-      int max_fast_elements =
-          (kMaxRegularHeapObjectSize - FixedArray::kHeaderSize -
-           JSArray::kHeaderSize - AllocationMemento::kSize) /
-          element_size;
-      Branch(SmiAboveOrEqual(array_size_smi, SmiConstant(max_fast_elements)),
+      Branch(SmiAboveOrEqual(array_size_smi,
+                             SmiConstant(JSArray::kInitialMaxFastElementArray)),
              &call_runtime, &small_smi_size);
     }