[stubs] Consolidate TryToName implementation

src/compiler/code-assembler.h

 // Copyright 2015 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_COMPILER_CODE_ASSEMBLER_H_
 #define V8_COMPILER_CODE_ASSEMBLER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 265 matching lines @@
 
   Node* WordShl(Node* value, int shift);
   Node* WordShr(Node* value, int shift);
   Node* Word32Shr(Node* value, int shift);
 
 // Unary
 #define DECLARE_CODE_ASSEMBLER_UNARY_OP(name) Node* name(Node* a);
   CODE_ASSEMBLER_UNARY_OP_LIST(DECLARE_CODE_ASSEMBLER_UNARY_OP)
 #undef DECLARE_CODE_ASSEMBLER_UNARY_OP
 
+  // Changes an intptr_t to a double, e.g. for storing an element index
+  // outside Smi range in a HeapNumber. Lossless on 32-bit,
+  // rounds on 64-bit (which doesn't affect valid element indices).
+  Node* RoundIntPtrToFloat64(Node* value);
   // No-op on 32-bit, otherwise zero extend.
   Node* ChangeUint32ToWord(Node* value);
   // No-op on 32-bit, otherwise sign extend.
   Node* ChangeInt32ToIntPtr(Node* value);
 
   // Projections
   Node* Projection(int index, Node* value);
 
   // Calls
   Node* CallRuntime(Runtime::FunctionId function_id, Node* context);
@@ skipping 182 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_