[patch tree-optimization 1/2]: Branch-cost optimizations

[Kai Tietz]

Hi,

with not much hope that this patch gets into 4.7 version, resent revised version for the first part of patch.  I updated the patch according to comments I got by matz on IRC  yesterday.
Patch uses now vector for collecting truth &/|'s conditional chain.  Additionally it checks now consistent for VA.values before trying to access DEF_STMT.

Bootstrapped and regression tested for all languages.  Ok for apply?

Regards,
Kai
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