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we're attempting to stay as close to mainline chibicc as possible
at a high level, the major changes made are:
- strip out most of proprocess.c, as we're OK with using GCC's preprocessor
(still need preprocess.c, as it handles parsing of literals)
- replace codegen.c to output C instead of assembly
to support these, ended up making some changes to the rest of the files. these
include:
- in type.c:usual_arith_conv,
- don't cast if they're already the right type
- for pointer arithmetic, leave it as pointer + long
- in parse.c:is_const_expr, also allow modulos to be const
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