[stubs] Ensure generated CalculateNewElementsCapacity is identical to runtime version

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index 97f77e22244d1b043c4cadfe483a075a9425b256..0dc8ffd3997515277480124d630071ff6e3c582b 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -1492,8 +1492,7 @@ Node* CodeStubAssembler::BuildAppendJSArray(ElementsKind kind, Node* context,
   Node* new_length =
       IntPtrOrSmiAdd(WordToParameter(growth, mode), var_length.value(), mode);
   GotoUnless(IntPtrOrSmiGreaterThan(new_length, capacity, mode), &fits);
-  Node* new_capacity = CalculateNewElementsCapacity(
-      IntPtrOrSmiAdd(new_length, IntPtrOrSmiConstant(1, mode), mode), mode);
+  Node* new_capacity = CalculateNewElementsCapacity(new_length, mode);
   var_elements.Bind(GrowElementsCapacity(array, var_elements.value(), kind,
                                          kind, capacity, new_capacity, mode,
                                          &pre_bailout));
@@ -2351,7 +2350,8 @@ Node* CodeStubAssembler::CalculateNewElementsCapacity(Node* old_capacity,
   }
   Node* half_old_capacity = WordShr(old_capacity, IntPtrConstant(1));
   Node* new_capacity = IntPtrAdd(half_old_capacity, old_capacity);
-  Node* unconditioned_result = IntPtrAdd(new_capacity, IntPtrConstant(16));
+  Node* unconditioned_result =
+      IntPtrAdd(new_capacity, IntPtrOrSmiConstant(16, mode));
   if (mode == SMI_PARAMETERS) {
     return SmiAnd(BitcastWordToTaggedSigned(unconditioned_result),
                   SmiConstant(-1));