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
(cherry picked from commit bd80f6625dec55d43bab409ab0b71b94472eff28)

Bug: 120510768
Change-Id: I9f95ec334742429a6995bd6a47a8841dc57f0175
1 file changed