transpile: Factor out more pointer-related functions #1521
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This factors out functions for two things: casts involving pointers, and null checking. In the case of
==and!=operators in a non-conditional context (in operators.rs), this also adds special handling for regular pointers, where only function pointers were specially handled previously. This means thatis now translated with the
is_nullmethod as well, instead of with the==operator andcore::ptr::null.