Kyle Butt 71b1ca1be4 Codegen: Tail Merge: Be less aggressive with special cases. ...

This change makes it possible for tail-duplication and tail-merging to
be disjoint. By being less aggressive when merging during layout, there are no
overlapping cases between tail-duplication and tail-merging, provided the
thresholds are disjoint.

There is a remaining TODO to benchmark the succ_size() test for non-layout tail
merging.

llvm-svn: 278265

2016-08-10 18:36:18 +00:00

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