[PATCH][StaticAnalyzer] new check comparing equal expression

[Per Viberg]

Hello,

changed patch according to review comments.

Please review revised patch. 

The patch adds a check that warns for comparison of equal expressions.
example:
x + 1 == x +1;

best regards,
Per

.......................................................................................................................
Per Viberg Senior Engineer
Evidente ES East AB  Warfvinges väg 34  SE-112 51 Stockholm  Sweden
Phone:    +46 (0)8 402 79 00
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E-mail:     Per.Viberg at evidente.se

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