13a520ab30
Summary: Pettis' paper on block layout (PLDI'90) suggests we should order clusters (or chains, using the paper terminology) using a specific criterion. This patch implements two distinct ideas for cluster layout that can be activated using different command-line flags. The first one reflects Pettis' ideas on minimizing branch mispredictions and the second one is targeted at reducing I-cache misses, described in the Ispike paper (CGO'04). (cherry picked from FBD2588693)
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