[cfe-commits] [Patch] Warn about |= in conditionals

[Hans Wennborg]

Hi,

The attached patch adds a warning for using |= without parentheses in
conditionals, as in:

if (a |= b) {}

and suggests replacing it with != or adding parentheses.

This is for http://llvm.org/bugs/show_bug.cgi?id=9001

Also, I considered whether it would make sense to warn for all
assignment operators in conditionals, and not just common typos (i.e.
= and |=). Do you think that would make sense?

Please review.

Thanks,
Hans
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