[turbofan] Add support for ARM64 Ubfx

src/base/utils/random-number-generator.h

 // Copyright 2013 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_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 #define V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 
 #include "src/base/macros.h"
 
 namespace v8 {
@@ skipping 50 matching lines @@
     return Next(1) != 0;
   }
 
   // Returns the next pseudorandom, uniformly distributed double value between
   // 0.0 and 1.0 from this random number generator's sequence.
   // The general contract of |NextDouble()| is that one double value, chosen
   // (approximately) uniformly from the range 0.0 (inclusive) to 1.0
   // (exclusive), is pseudorandomly generated and returned.
   double NextDouble() WARN_UNUSED_RESULT;
 
+  // Returns the next pseudorandom, uniformly distributed int64 value from this
+  // random number generator's sequence. The general contract of |NextInt64()|
+  // is that one 64-bit int value is pseudorandomly generated and returned.
+  // All 2^64 possible integer values are produced with (approximately) equal
+  // probability.
+  int64_t NextInt64() WARN_UNUSED_RESULT;
+
   // Fills the elements of a specified array of bytes with random numbers.
   void NextBytes(void* buffer, size_t buflen);
 
   // Override the current ssed.
   void SetSeed(int64_t seed);
 
   int64_t initial_seed() const { return initial_seed_; }
 
  private:
   static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d);
   static const int64_t kAddend = 0xb;
   static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff);
 
   int Next(int bits) WARN_UNUSED_RESULT;
 
   int64_t initial_seed_;
   int64_t seed_;
 };
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_