[cfe-commits] [Patch] Add a warning for for loops with conditions that do not change

[Richard Trieu]

New patch for the for-loop warning.

Changes:
Both visitors are now EvaluatedExprVisitor
The DeclExtractor, used on the conditional, works on a whitelist of Expr's
instead of a blacklist.
Fixed edge cases in the DeclMatcher with respect to LValueToRValue
conversions.  Some casts aren't directly on DeclRefExprs.
Added variable names to the warning.  Up to 4 variable names will be
displayed.
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