Explicitly set C++ standard for `Posix/no-fd.cc` ASan test.

Summary:
The test uses `nullptr` which can break running the test if the
compiler happens to be using something older than C++11 as the default
language standard. Avoid this by explicitly setting the standard.

rdar://problem/47253542

Reviewers: eugenis, yln, vitalybuka

Subscribers: kubamracek, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D56667

llvm-svn: 351169

compiler-rt/test/asan/TestCases/Posix/no-fd.cc

@@ -1,4 +1,4 @@
-// RUN: %clangxx_asan -O0 %s -o %t
+// RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 // RUN: %env_asan_opts=debug=1,verbosity=2 %run %t 2>&1 | FileCheck %s