[scudo][test] Disable -Wfree-nonheap-object

[leonardchan]

Summary

As of 4f395db86b5cc11bb56853323d3cb1d4b6db5a0b which contains updates to -Wfree-nonheap-object, a line in this test will trigger the warning. This particular line is ok though since it's meant to test a free on a bad pointer.

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

 
 static const size_t Size = 100U;
 
 TEST(ScudoWrappersCTest, Malloc) {
   void *P = malloc(Size);
   EXPECT_NE(P, nullptr);
   EXPECT_LE(Size, malloc_usable_size(P));
   EXPECT_EQ(reinterpret_cast<uintptr_t>(P) % FIRST_32_SECOND_64(8U, 16U), 0U);
+
+  // An update to this warning in Clang now triggers in this line, but it's ok
+  // because the check is expecting a bad pointer and should fail.
+#if defined(__has_warning) && __has_warning("-Wfree-nonheap-object")
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wfree-nonheap-object"
+#endif
   EXPECT_DEATH(
       free(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(P) | 1U)), "");
+#if defined(__has_warning) && __has_warning("-Wfree-nonheap-object")
+#pragma GCC diagnostic pop
+#endif
+
   free(P);
   EXPECT_DEATH(free(P), "");
 
   P = malloc(0U);
   EXPECT_NE(P, nullptr);
   free(P);
 
   errno = 0;