Extend IdenticalExprChecker to find more potential problems

[Daniel Fahlgren]

Hi Jordan

On Thu, 2014-01-30 at 09:47 -0800, Jordan Rose wrote:
> Hi, Daniel. Can you split these two checks up into separate patches? I
> know they're pretty similar and have the same basic idea, but we like
> to have commits be limited to one new feature at a time. (Combining
> bitwise and logical operators into one is fine, though.) Sorry it's a
> bit more work for you to tease them apart.

Thanks for taking the time and look at this. I'll try to address your
comments during the weekend.

Cheers,
Daniel Fahlgren