Adding GetMoreGeneralElementsKind in elements-kind.h

src/runtime/runtime-array.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/elements.h"
 #include "src/factory.h"
@@ skipping 712 matching lines @@
   uint32_t estimate_nof_elements = 0;
   for (int i = 0; i < argument_count; i++) {
     HandleScope loop_scope(isolate);
     Handle<Object> obj(elements->get(i), isolate);
     uint32_t length_estimate;
     uint32_t element_estimate;
     if (obj->IsJSArray()) {
       Handle<JSArray> array(Handle<JSArray>::cast(obj));
       length_estimate = static_cast<uint32_t>(array->length()->Number());
       if (length_estimate != 0) {
-        ElementsKind array_kind =
-            GetPackedElementsKind(array->map()->elements_kind());
-        if (IsMoreGeneralElementsKindTransition(kind, array_kind)) {
-          kind = array_kind;
-        }
+        kind = GetMoreGeneralElementsKind(
+            kind, GetPackedElementsKind(array->map()->elements_kind()));
       }
       element_estimate = EstimateElementCount(array);
     } else {
       if (obj->IsHeapObject()) {
         if (obj->IsNumber()) {
-          if (IsMoreGeneralElementsKindTransition(kind, FAST_DOUBLE_ELEMENTS)) {
-            kind = FAST_DOUBLE_ELEMENTS;
-          }
-        } else if (IsMoreGeneralElementsKindTransition(kind, FAST_ELEMENTS)) {
-          kind = FAST_ELEMENTS;
+          kind = GetMoreGeneralElementsKind(kind, FAST_DOUBLE_ELEMENTS);
+        } else {
+          kind = GetMoreGeneralElementsKind(kind, FAST_ELEMENTS);
         }
       }
       length_estimate = 1;
       element_estimate = 1;
     }
     // Avoid overflows by capping at kMaxElementCount.
     if (JSObject::kMaxElementCount - estimate_result_length < length_estimate) {
       estimate_result_length = JSObject::kMaxElementCount;
     } else {
       estimate_result_length += length_estimate;
@@ skipping 514 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_FastOneByteArrayJoin) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   // Returning undefined means that this fast path fails and one has to resort
   // to a slow path.
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8