jan17: remove `zig_is_stage2` from `@import("builtin")`

Instead use the standarized option for communicating the
zig compiler backend at comptime, which is `zig_backend`. This was
introduced in commit 1c24ef0d0b09a12a1fe98056f2fc04de78a82df3.

Jan 1

jan1

behavior tests: add a "passing for arm backend" section

December 30th

dec30

For unused references & redundant keywords, append the compiler error…

prebuilt

dec20

Fix typo in hash map