scudo: Switch from std::random_shuffle to std::shuffle in a test.

[pcc]

Summary

This lets the test build with C++17.

compiler-rt/lib/scudo/standalone/tests/secondary_test.cpp

 //===-- secondary_test.cpp --------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "secondary.h"
 
 #include "gtest/gtest.h"
 
 #include <stdio.h>
 
 #include <condition_variable>
 #include <mutex>
+#include <random>
 #include <thread>
 
 template <class SecondaryT> static void testSecondaryBasic(void) {
   scudo::GlobalStats S;
   S.init();
   SecondaryT *L = new SecondaryT;
   L->init(&S);
   const scudo::uptr Size = 1U << 16;
template <class SecondaryT> static void testSecondaryBasic(void) {
   void *AlignedP = reinterpret_cast<void *>(
       scudo::roundUpTo(reinterpret_cast<scudo::uptr>(P), Align));
   memset(AlignedP, 'A', Size);
   L->deallocate(P);
 
   std::vector<void *> V;
   for (scudo::uptr I = 0; I < 32U; I++)
     V.push_back(L->allocate(Size));
-  std::random_shuffle(V.begin(), V.end());
+  std::shuffle(V.begin(), V.end(), std::mt19937(std::random_device()()));
   while (!V.empty()) {
     L->deallocate(V.back());
     V.pop_back();
   }
   scudo::ScopedString Str(1024);
   L->getStats(&Str);
   Str.output();
 }