Do not treat calls to address 0 as calls, because these are only found in unreachable basic blocks that gcc failed to remove.

Fix infinite loops and crashes related to unreachable blocks and SSE/MMX instructions and registers.

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Make add-with-carry and sub-with-borrow usually like add and sub, but with the possibility of changing the register type from POINTER to NUMERIC.

Expand SAFE function criteria for SMP project to ignore indirect non-stack writes and writes above the return address.