[PATCH] [Analyzer] Implementation of UnaryPlusChecker

[Jordan Rose]

> 
> 
> Concerning ideas on how the UnaryPlusChecker checker could be improved. What about detecting "=+" written instead of "+=" as in the following test:
> 
> void test() {
>    unsigned int i = 7;
>    i =+ i;  // d you mean '+=' ?
>    i =+ 7;  // did you mean '+=' ?
> }
> 
> What do you think?

Clang already does this, as a compiler warning:

<stdin>:3:6: warning: use of unary operator that may be intended as compound
      assignment (+=)
   i =+ i;  // d you mean '+=' ?
     ^~
<stdin>:4:6: warning: use of unary operator that may be intended as compound
      assignment (+=)
   i =+ 7;  // did you mean '+=' ?
     ^~
 
…so I think we're good. :-)
Jordan
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