[csa] Add ToLength and ToString variants with inlined fast checks

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 835 matching lines @@
   // Convert any object to a Number.
   Node* ToNumber(Node* context, Node* input);
 
   // Converts |input| to one of 2^32 integer values in the range 0 through
   // 2^32-1, inclusive.
   // ES#sec-touint32
   compiler::Node* ToUint32(compiler::Node* context, compiler::Node* input);
 
   // Convert any object to a String.
   Node* ToString(Node* context, Node* input);
+  Node* ToString_Inline(Node* const context, Node* const input);
 
   // Convert any object to a Primitive.
   Node* JSReceiverToPrimitive(Node* context, Node* input);
 
   enum ToIntegerTruncationMode {
     kNoTruncation,
     kTruncateMinusZero,
   };
 
   // ES6 7.1.17 ToIndex, but jumps to range_error if the result is not a Smi.
   Node* ToSmiIndex(Node* const input, Node* const context, Label* range_error);
 
   // ES6 7.1.15 ToLength, but jumps to range_error if the result is not a Smi.
   Node* ToSmiLength(Node* input, Node* const context, Label* range_error);
 
+  // ES6 7.1.15 ToLength, but with inlined fast path.
+  Node* ToLength_Inline(Node* const context, Node* const input);
+
   // Convert any object to an Integer.
   Node* ToInteger(Node* context, Node* input,
                   ToIntegerTruncationMode mode = kNoTruncation);
 
   // Returns a node that contains a decoded (unsigned!) value of a bit
   // field |T| in |word32|. Returns result as an uint32 node.
   template <typename T>
   Node* DecodeWord32(Node* word32) {
     return DecodeWord32(word32, T::kShift, T::kMask);
   }
@@ skipping 739 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_