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This adds support for `-tailcallopt` tail calls to CallLowering. This piggy-backs off the changes from D67577, since doing it without a bit of refactoring gets extremely ugly. Support is basically ported from AArch64ISelLowering. The main difference here is that tail calls in `-tailcallopt` change the ABI, so there's some extra bookkeeping for the stack. Show that we are correctly lowering these by updating tail-call.ll. Also show that we don't do anything strange in general by updating fastcc-reserved.ll, which passes `-tailcallopt`, but doesn't emit any tail calls. Differential Revision: https://reviews.llvm.org/D67580 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372177 91177308-0d34-0410-b5e6-96231b3b80d8