Add optnone to work with new clang compiler am: f83b626766

Original change: https://android-review.googlesource.com/c/platform/system/testing/gtest_extras/+/1895914

Change-Id: I48a84f3365d624ddbd732631b73d149f80c43775
diff --git a/tests/SystemTests.cpp b/tests/SystemTests.cpp
index ef280df..25470b0 100644
--- a/tests/SystemTests.cpp
+++ b/tests/SystemTests.cpp
@@ -1424,7 +1424,7 @@
   ASSERT_EQ(1, 0);
 }
 
-TEST_F(SystemTests, DISABLED_crash) {
+TEST_F(SystemTests, DISABLED_crash) __attribute__((optnone)) {
   char* p = reinterpret_cast<char*>(static_cast<intptr_t>(atoi("0")));
   *p = 3;
 }