Patch for PR analyzer/98797

[brian.sobulefsky]

The attached patch has been bootstrapped and regression tested. It addresses PR analyzer/98797, which is built off the expected failures in gcc/testsuite/gcc.dg/analyzer/casts-1.c It fixes those failures and additional manifestations. That testsuite file has been updated to no longer expect failures and to include additional tests addressing the other manifestations I found.

Some additional work can probably be done to handle further cases, but this is now substantially more robust than the current status.

Thanks.
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