[MachineOutliner] Leaf Descendants #90275
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In the current implementation, only leaf children of each internal node in the suffix tree are included as candidates for outlining. But all leaf descendants are outlining candidates, which we include in the new implementation.
For Clang/LLD, it shows around 3% reduction in text segment size when compared to the baseline
-Ozlinker binary.This is part of an enhanced version of machine outliner -- see RFC.