rBreak Critical Edges and other MIR work#32210

Merged

bors merged 7 commits intorust-lang:masterfrom

Aatch:mir-traversal

Apr 3, 2016

Commits on Mar 29, 2016

Commits on Mar 30, 2016

Commits on Mar 31, 2016

Turn break critical edges into a MIR pass
Aatch
committed

Commits on Apr 3, 2016

Use a BitVector instead of Vec<bool> for recording cleanup blocks
Aatch
committed