Michael Schimmel
0107264026
This commit introduces purity inference to the compiler's optimizer. This allows for more aggressive constant folding and dead code elimination by tracking which functions and global variables are free of side effects. Key changes include: - Added `global_purity` field to `Optimizer` and `Environment`. - Modified `Optimizer::is_pure` to recursively determine if an AST node represents a pure computation. - Introduced `Optimizer::try_fold_pure` to replace the old `try_fold_intrinsic`, enabling folding of pure function calls with constant arguments. - Updated `Environment::register_native` and `Environment::register_constant` to optionally record purity. - Added purity flags to several built-in functions in `core.rs` and `datetime.rs`. - A new example `optimizer_purity.myc` demonstrates the new feature.