[TSan] Fix test failing on Linux
Cherry-picking for CI to swift-5.1-branch release branch so that it
propagates to stable.
// Check that calling dispatch_once from a report callback works.
// RUN: %clang_tsan %s -o %t
-// RUN: not %run %t 2>&1 | FileCheck %s
+// RUN: not %env_tsan_opts=ignore_noninstrumented_modules=0 %run %t 2>&1 | FileCheck %s
#include <dispatch/dispatch.h>
