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* AstGen: implement "unreachable code" error for blocks. This works at the statement level. * stage1: remove the "unreachable code" error implementation, which means removing the `is_gen` field from IrInstSrc. This is one small step towards a smaller memory footprint for stage1. The benefits won't be realized until a future commit because this flag took advantage of padding. There may be a regression here with "union has no associated enum" error, and there is a regression with the following code: ```zig const a = noreturn; ``` A future commit will address these regressions.