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tail call optimization. Some more work may be needed for indirect calls but this patch fixes the current regression in Prolangc++/trees. S2 optimization as part of the general cleanup and optimization of prolog and epilog was not saving S2 in this case and needed to. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197630 91177308-0d34-0410-b5e6-96231b3b80d8