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When we implemented array cookie support for hardening std::unique_ptr, the implementation was only done for the Itanium ABI. I did not initially realize that ARM was using a different ABI for array cookies, so unique_ptr should not have been hardened on ARM. However, we were also incorrectly setting the ABI-detection macro: we were pretending to be using a vanilla Itanium ABI when in reality the (similar but different) ARM ABI was in use. As a result, unique_ptr was using the wrong representation for array cookies on ARM, which fortunately only mattered in the case of overaligned types. This patch fixes that. rdar://160852193 (cherry picked from commit b3a199469c9d54fb3bdabf6dff5677b401f8fef6)