[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

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 "src/compiler/code-assembler.h"
 #include "src/objects.h"
 
@@ skipping 151 matching lines @@
   compiler::Node* AllocateHeapNumberWithValue(compiler::Node* value);
   // Allocate a SeqOneByteString with the given length.
   compiler::Node* AllocateSeqOneByteString(int length);
   // Allocate a SeqTwoByteString with the given length.
   compiler::Node* AllocateSeqTwoByteString(int length);
 
   compiler::Node* TruncateTaggedToFloat64(compiler::Node* context,
                                           compiler::Node* value);
   compiler::Node* TruncateTaggedToWord32(compiler::Node* context,
                                          compiler::Node* value);
-  // Truncate to int32 using JavaScript truncation mode.
-  compiler::Node* TruncateFloat64ToInt32(compiler::Node* value);
   // Truncate the floating point value of a HeapNumber to an Int32.
   compiler::Node* TruncateHeapNumberValueToWord32(compiler::Node* object);
 
   // Conversions.
   compiler::Node* ChangeFloat64ToTagged(compiler::Node* value);
   compiler::Node* ChangeInt32ToTagged(compiler::Node* value);
   compiler::Node* ChangeUint32ToTagged(compiler::Node* value);
 
   // Type conversions.
   // Throws a TypeError for {method_name} if {value} is not coercible to Object,
@@ skipping 25 matching lines @@
   compiler::Node* AllocateRawUnaligned(compiler::Node* size_in_bytes,
                                        AllocationFlags flags,
                                        compiler::Node* top_adddress,
                                        compiler::Node* limit_address);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUB_ASSEMBLER_H_