[Turbofan] Allow recursive inlining
Currently, we do not inline recursive functions. This is in general a good idea but could be useful in some cases. For example, in rayTrace there is a class.create function to create new classes, which basically calls the initialize function on the object. When there are classes which instantiate other classes this leads to recursion. These are really small functions (within the small function budget) and it is good to inline them. Allowing such functions to inline improves the score on rayTrace by 12-16% and box2d by 24-30%. There is also an absolute limit on the maximum levels of inlining to avoid any corner cases and to ensure inlining always terminates. Bug: v8:6682 Change-Id: I6784f68d6395097d126c0850b1a1336b6583d958 Reviewed-on: https://chromium-review.googlesource.com/608235Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Commit-Queue: Mythri Alle <mythria@chromium.org> Cr-Commit-Position: refs/heads/master@{#47255}
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