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[analyzer] Minor optimization: avoid setting state if unchanged

Authored by ddcc on Nov 14 2016, 5:40 PM.

Description

[analyzer] Minor optimization: avoid setting state if unchanged

Summary: Split out optimization from D26061

Reviewers: zaks.anna, dcoughlin

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D26642

llvm-svn: 286925