[CodeGen][NFC] Fix test/CodeGen/pr45476.cpp to specify target triple.
Summary:
Use explicit target triple to match more accurately the output for libcall
or native atomic.
Similar to D74847, without explicit target triple, this test will fail for ARM.
This patch update test pr45476.cpp to check for both native atomic and libcall.
Reviewers: efriedma, ekatz, rjmccall, rsmith, luismarques
Reviewed By: efriedma
Subscribers: kristof.beyls, jfb, cfe-commits, llvm-commits
Tags: #llvm, #clang
Differential Revision: https://reviews.llvm.org/D79914