When inlining a function and adding its inner call sites to the
candidate set for subsequent inlining, try to simplify the arguments to the inner call site now that inlining has been performed. The goal here is to propagate and fold constants through deeply nested call chains. Without doing this, we loose the inliner bonus that should be applied because the arguments don't match the exact pattern the cost estimator uses. Reviewed on IRC by Benjamin Kramer. llvm-svn: 152556
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