[compiler-rt] [compiler-rt][nsan] Add more tests for shadow memory (PR #100906)

[Alexander Shaposhnikov via llvm-commits]

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+// RUN: %clangxx_nsan -O2 -g %s -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+
+// RUN: %clangxx_nsan  -fno-builtin -O2 -g %s -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+
+// This tests a particularaly hard case of memory tracking. stable_sort does
+// conditional swaps of pairs of elements with mixed types (int/double).
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdio>
+#include <utility>
+#include <vector>
+
+extern "C" void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes,
+                                       size_t bytes_per_line, size_t reserved);
+
+__attribute__((noinline)) void Run(std::vector<int> &indices,
+                                   std::vector<double> &values) {
+  const auto num_entries = indices.size();
+  std::vector<std::pair<int, double>> entries;
+  entries.reserve(num_entries);
+  for (int i = 0; i < num_entries; ++i) {
+    entries.emplace_back(indices[i], values[i]);
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alexander-shaposhnikov wrote:

done

https://github.com/llvm/llvm-project/pull/100906