message: Remove hwrand_initialized.
  All access to hwrand is now gated by GetRNGState, which initializes the hwrand code.
diff: @@ -76,7 +76,6 @@ static inline int64_t GetPerformanceCounter()
  }
  #if defined(__x86_64__) || defined(__amd64__) || defined(__i386__)
  -static std::atomic<bool> hwrand_initialized{false};
  static bool rdrand_supported = false;
  static constexpr uint32_t CPUID_F1_ECX_RDRAND = 0x40000000;
  static void InitHardwareRand()
  @@ -85,12 +84,10 @@ static void InitHardwareRand()
  if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) && (ecx & CPUID_F1_ECX_RDRAND)) {
  rdrand_supported = true;
  }
  - hwrand_initialized.store(true);
  }
  static void ReportHardwareRand()
  {
  - assert(hwrand_initialized.load(std::memory_order_relaxed));
  if (rdrand_supported) {
  // This must be done in a separate function, as HWRandInit() may be indirectly called
  // from global constructors, before logging is initialized.
  @@ -110,7 +107,6 @@ static void ReportHardwareRand() {}
  static bool GetHardwareRand(unsigned char* ent32) {
  #if defined(__x86_64__) || defined(__amd64__) || defined(__i386__)
  - assert(hwrand_initialized.load(std::memory_order_relaxed));
  if (rdrand_supported) {
  uint8_t ok;
  // Not all assemblers support the rdrand instruction, write it in hex.
  