Adding smi cache

src/parsing/scanner.cc

 // Copyright 2011 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.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #include "src/parsing/scanner.h"
 
 #include <stdint.h>
 
@@ skipping 1135 matching lines @@
         while (IsDecimalDigit(c0_)) {
           value = 10 * value + (c0_ - '0');
 
           uc32 first_char = c0_;
           Advance<false, false>();
           AddLiteralChar(first_char);
         }
 
         if (next_.literal_chars->one_byte_literal().length() <= 10 &&
             value <= Smi::kMaxValue && c0_ != '.' && c0_ != 'e' && c0_ != 'E') {
-          next_.smi_value_ = static_cast<int>(value);
+          next_.smi_value_ = static_cast<uint32_t>(value);
           literal.Complete();
           HandleLeadSurrogate();
 
           if (kind == DECIMAL_WITH_LEADING_ZERO)
             decimal_with_leading_zero_pos_ = Location(start_pos, source_pos());
           return Token::SMI;
         }
         HandleLeadSurrogate();
       }
 
@@ skipping 469 matching lines @@
   // 2, reset the source to the desired position,
   source_->Seek(position);
   // 3, re-scan, by scanning the look-ahead char + 1 token (next_).
   c0_ = source_->Advance();
   Next();
   DCHECK_EQ(next_.location.beg_pos, position);
 }
 
 }  // namespace internal
 }  // namespace v8