[ubsan] Drop dependency on a 64-bit arch in a test (NFC)
[ubsan] Drop dependency on a 64-bit arch in a test (NFC)

This should fix:

    http://lab.llvm.org:8011/builders/clang-hexagon-elf/builds/46184

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@284642 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 51f62d67d98fb6f1d8a9d0aa0d5371981ec0ee44)

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang