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[analyzer] Fix hidden node traversal in exploded graph dumps.

Authored by dergachev.a on Oct 18 2019, 1:15 PM.

Description

[analyzer] Fix hidden node traversal in exploded graph dumps.

The joined nodes now actually have the same state. That was intended
from the start but the original implementation turned out to be buggy.

Differential Revision: https://reviews.llvm.org/D69150

llvm-svn: 375278