[turbofan] Smartify typing of NumberToInt32 and NumberToUint32.

src/compiler/typer.h

 // 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.
 
 #ifndef V8_COMPILER_TYPER_H_
 #define V8_COMPILER_TYPER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/graph.h"
@@ skipping 29 matching lines @@
   Zone* zone_;
   Type* negative_signed32;
   Type* non_negative_signed32;
   Type* undefined_or_null;
   Type* singleton_false;
   Type* singleton_true;
   Type* singleton_zero;
   Type* singleton_one;
   Type* zero_or_one;
   Type* zeroish;
+  Type* signed32ish;
+  Type* unsigned32ish;
   Type* falsish;
   Type* integer;
   Type* weakint;
   Type* number_fun0_;
   Type* number_fun1_;
   Type* number_fun2_;
   Type* weakint_fun1_;
   Type* imul_fun_;
   Type* clz32_fun_;
   Type* random_fun_;
   Type* array_buffer_fun_;
   Type* int8_array_fun_;
   Type* int16_array_fun_;
   Type* int32_array_fun_;
   Type* uint8_array_fun_;
   Type* uint16_array_fun_;
   Type* uint32_array_fun_;
   Type* float32_array_fun_;
   Type* float64_array_fun_;
 
   ZoneVector<Handle<Object> > weaken_min_limits_;
   ZoneVector<Handle<Object> > weaken_max_limits_;
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_TYPER_H_