[libcxxabi] Fix test_exception_address_alignment test for ARM

Check _LIBCXXABI_ARM_EHABI macro instead of libunwind version.

Fixes PR34182

Differential revision: https://reviews.llvm.org/D50170

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@339865 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/test_exception_address_alignment.pass.cpp b/test/test_exception_address_alignment.pass.cpp
index 138fb4d..5d36659 100644
--- a/test/test_exception_address_alignment.pass.cpp
+++ b/test/test_exception_address_alignment.pass.cpp
@@ -20,6 +20,7 @@
 
 #include <cstdint>
 #include <cassert>
+#include <__cxxabi_config.h>
 
 #include <unwind.h>
 
@@ -27,7 +28,7 @@
 
 // EHABI  : 8-byte aligned
 // Itanium: Largest supported alignment for the system
-#if defined(_LIBUNWIND_ARM_EHABI)
+#if defined(_LIBCXXABI_ARM_EHABI)
 #  define EXPECTED_ALIGNMENT 8
 #else
 #  define EXPECTED_ALIGNMENT alignof(AlignedType)