[CodeGenCXX] XFAIL test for ASAN on Darwin.

The test hits stack overflow trying to instantiate recursive templates.
It is observed with ASAN and not with a regular build because ASAN
increases stack frame size.

rdar://problem/45009892

Reviewers: george.karpenkov, lebedev.ri

Reviewed By: george.karpenkov

Subscribers: dexonsmith, rjmccall, cfe-commits

Differential Revision: https://reviews.llvm.org/D54132

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@346200 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit ffeab27)

test/CodeGenCXX/castexpr-basepathsize-threshold.cpp

@@ -3,6 +3,10 @@
 // https://bugs.llvm.org/show_bug.cgi?id=38356
 // We only check that we do not crash.
 
+// ASAN increases stack usage, so we are hitting stack overflow before reaching
+// recursive template instantiation limit.
+// XFAIL: darwin && asan
+
 template <typename a, a b(unsigned), int c, unsigned...>
 struct d : d<a, b, c - 1> {};
 template <typename a, a b(unsigned), unsigned... e>