C++: Make IRGuardCondition
handle p
in if(p)
and if(!p)
better in C programs
#16533
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This improves our
GuardCondition
support for reasoning aboutp
in the following example:This was actually the thing I excluded in #16364 and #16364 (comment) explains why this is non-trivial. This PR does the non-trivial work required to infer the right (in)equalities.