A64: Handle a few TODOs.

src/a64/utils-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 23 matching lines @@
 
 #define REGISTER_CODE_LIST(R)                                                  \
 R(0)  R(1)  R(2)  R(3)  R(4)  R(5)  R(6)  R(7)                                 \
 R(8)  R(9)  R(10) R(11) R(12) R(13) R(14) R(15)                                \
 R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23)                                \
 R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
 
 namespace v8 {
 namespace internal {
 
+// These are global assumptions in v8.
+STATIC_ASSERT((static_cast<int32_t>(-1) >> 1) == -1);
+STATIC_ASSERT((static_cast<uint32_t>(-1) >> 1) == 0x7FFFFFFF);
+
 // Floating point representation.
 static inline uint32_t float_to_rawbits(float value) {
   uint32_t bits = 0;
   memcpy(&bits, &value, 4);
   return bits;
 }
 
 
 static inline uint64_t double_to_rawbits(double value) {
   uint64_t bits = 0;
@@ skipping 46 matching lines @@
 
 
 template <typename T>
 inline bool IsQuietNaN(T num) {
   return std::isnan(num) && !IsSignallingNaN(num);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_UTILS_A64_H_