These tests rely on running IR code with an explicit x86_64 target triple. They won't work on other architectures. (They won't work for 32-bit processes on x86_64 hosts either. We will take care of this later.)
Differential Revision: https://reviews.llvm.org/D107640
(cherry picked from commit c5ab55f5331c9da3c352b61d10d2f8a470a08b5b)