[stubs] Factor CSA::GrowElementsCapacity() out of existing code.

src/code-stub-assembler.h

 // Copyright 2016 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 348 matching lines @@
   // |to_kind| elements.
   compiler::Node* LoadElementAndPrepareForStore(compiler::Node* array,
                                                 compiler::Node* offset,
                                                 ElementsKind from_kind,
                                                 ElementsKind to_kind,
                                                 Label* if_hole);
 
   compiler::Node* CalculateNewElementsCapacity(
       compiler::Node* old_capacity, ParameterMode mode = INTEGER_PARAMETERS);
 
-  compiler::Node* CheckAndGrowElementsCapacity(compiler::Node* context,
-                                               compiler::Node* elements,
-                                               ElementsKind kind,
-                                               compiler::Node* key,
-                                               Label* fail);
+  // Tries to grow the |elements| array of given |object| to store the |key|
+  // or bails out if the growing gap is too big.

[Jakob Kummerow, 2016/09/09 10:49:35]

nit: add "Returns the new elements." here and below.

+  compiler::Node* TryGrowElementsCapacity(compiler::Node* object,
+                                          compiler::Node* elements,
+                                          ElementsKind kind,
+                                          compiler::Node* key, Label* bailout);
+
+  // Tries to grow the |capacity|-length |elements| array of given |object|
+  // to store the |key| or bails out if the growing gap is too big.
+  compiler::Node* TryGrowElementsCapacity(compiler::Node* object,
+                                          compiler::Node* elements,
+                                          ElementsKind kind,
+                                          compiler::Node* key,
+                                          compiler::Node* capacity,
+                                          ParameterMode mode, Label* bailout);
+
+  // Grows elements capacity of given object. Returns new elements.
+  compiler::Node* GrowElementsCapacity(
+      compiler::Node* object, compiler::Node* elements, ElementsKind from_kind,
+      ElementsKind to_kind, compiler::Node* capacity,
+      compiler::Node* new_capacity, ParameterMode mode, Label* bailout);
 
   // Allocation site manipulation
   void InitializeAllocationMemento(compiler::Node* base_allocation,
                                    int base_allocation_size,
                                    compiler::Node* allocation_site);
 
   compiler::Node* TruncateTaggedToFloat64(compiler::Node* context,
                                           compiler::Node* value);
   compiler::Node* TruncateTaggedToWord32(compiler::Node* context,
                                          compiler::Node* value);
@@ skipping 292 matching lines @@
   compiler::Node* SmiShiftBitsConstant();
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_