Andrew Kelley 4beff80b2f stage2: codegen handles undefined values ...

* `optimize_mode` is passed to `link.File` and stored there
 * improve the debugging function `Module.dumpInst`
 * get rid of `Value.the_one_possible_value` in favor of a few more
   specific values for different types. This is less buggy, one less
   footgun.
 * `Type.onePossibleValue` now returns a `?Value` instead of `bool`.
 * codegen handles undefined values. `undef` is a new `MCValue` tag.
   It uses 0xaa values depending on optimization mode. However
   optimization mode does not yet support scope overrides.
 * link.zig: move the `Options` field from `File.Elf` and `File.C` to
   the base struct.
   - fix the Tag enum to adhere to style conventions
 * ZIR now supports emitting undefined values.
 * Fix the logic of comptime math to properly compare against zero using
   the `compareWithZero` function.

2020-07-29 02:29:37 -07:00

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