Use getPredicateOnEdge method if value is a non-local
compare-with-a-constant instruction, that can give more precise
results than getConstantOnEdge.
Differential Revision: https://reviews.llvm.org/D131956
As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546