Fuzz fixes#1114

Merged

kripken merged 2 commits intomasterfrom

Jul 27, 2017

Commits on Jul 23, 2017

ignore untaken branches in determining block type
kripken
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Commits on Jul 24, 2017

when finalizing a block in MergeBlocks, use its type, so that we don't need to consider type changes for its parent (changing it from a forced i32 to an unreachable might mean the parent needs to b…
kripken
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