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-tailcallopt requires that we perform different stack adjustments than with sibling calls. For example, the `@caller_to0_from8` function in test/CodeGen/AArch64/tail-call.ll requires that we adjust SP. Without -tailcallopt, this adjustment does not happen. With it, however, it is expected. So, to ensure that adding sibling call support doesn't break -tailcallopt, make CallLowering always fall back on possible tail calls when -tailcallopt is passed in. Update test/CodeGen/AArch64/tail-call.ll with a GlobalISel line to make sure that we don't differ from the SDAG implementation at any point. Differential Revision: https://reviews.llvm.org/D67245 llvm-svn: 371227