Rollup merge of #73981 - ehuss:remove-ignore-stage1, r=nikomatsakis

Rollup merge of #73981 - ehuss:remove-ignore-stage1, r=nikomatsakis

Remove some `ignore-stage1` annotations.

These tests appear to no longer need the `ignore-stage1` marker.

- `run-make-fulldeps/issue-37839` and `run-make-fulldeps/issue-37893`: I believe these were due to the use of proc-macros, and probably were just missed in #49219 which fixed the proc-macro compatibility.

- `compile-fail/asm-src-loc-codegen-units.rs`: This was due to an old issue with landing pads (as mentioned in the linked issue #20184). `-Zno-landing-pads` was an option when building the first stage (it was much faster), but somewhere along the way (I think the switch from makefiles to rustbuild), the option was removed.
  - NOTE: This test doesn't actually test what it was originally written for, and is probably mostly pointless now. This test was asserting the message "build without -C codegen-units for more exact errors", but that was removed in #42682. It is now in essence identical to `asm-src-loc.rs`.