[WIP] compiler: dont try to compile impossible alignment on 16-bit

[workingjubilee]

Was originally intended to solve #131122 but I'm not very happy with the lack of a span. Forgot about it and then remembered it was sitting around. Mostly posting this so @asquared31415 can cannibalize it if desired in the process of coming up with a better solution maybe.

r? @ghost

[rust-log-analyzer]

The job mingw-check-tidy failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

COPY host-x86_64/mingw-check/validate-toolstate.sh /scripts/
COPY host-x86_64/mingw-check/validate-error-codes.sh /scripts/

# NOTE: intentionally uses python2 for x.py so we can test it still works.
# validate-toolstate only runs in our CI, so it's ok for it to only support python3.
ENV SCRIPT TIDY_PRINT_DIFF=1 python2.7 ../x.py test \
           --stage 0 src/tools/tidy tidyselftest --extra-checks=py:lint,cpp:fmt
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    pip-compile --allow-unsafe --generate-hashes reuse-requirements.in
---
#13 2.813 Building wheels for collected packages: reuse
#13 2.814   Building wheel for reuse (pyproject.toml): started
#13 3.058   Building wheel for reuse (pyproject.toml): finished with status 'done'
#13 3.059   Created wheel for reuse: filename=reuse-4.0.3-cp310-cp310-manylinux_2_35_x86_64.whl size=132715 sha256=dfa09868353292d98f811d3efdb0d54d07389e808efc71d68e3b93c514bf8bec
#13 3.059   Stored in directory: /tmp/pip-ephem-wheel-cache-ziz8_fj7/wheels/3d/8d/0a/e0fc6aba4494b28a967ab5eaf951c121d9c677958714e34532
#13 3.062 Installing collected packages: boolean-py, binaryornot, tomlkit, reuse, python-debian, markupsafe, license-expression, jinja2, chardet, attrs
#13 3.445 Successfully installed attrs-23.2.0 binaryornot-0.4.4 boolean-py-4.0 chardet-5.2.0 jinja2-3.1.4 license-expression-30.3.0 markupsafe-2.1.5 python-debian-0.1.49 reuse-4.0.3 tomlkit-0.13.0
#13 3.445 WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
#13 3.969 Collecting virtualenv
#13 3.969 Collecting virtualenv
#13 4.029   Downloading virtualenv-20.26.6-py3-none-any.whl (6.0 MB)
#13 4.313      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 6.0/6.0 MB 21.3 MB/s eta 0:00:00
#13 4.373 Collecting filelock<4,>=3.12.2
#13 4.382   Downloading filelock-3.16.1-py3-none-any.whl (16 kB)
#13 4.418 Collecting platformdirs<5,>=3.9.1
#13 4.427   Downloading platformdirs-4.3.6-py3-none-any.whl (18 kB)
#13 4.447 Collecting distlib<1,>=0.3.7
#13 4.469      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 468.9/468.9 KB 41.2 MB/s eta 0:00:00
#13 4.469      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 468.9/468.9 KB 41.2 MB/s eta 0:00:00
#13 4.549 Installing collected packages: distlib, platformdirs, filelock, virtualenv
#13 4.735 Successfully installed distlib-0.3.8 filelock-3.16.1 platformdirs-4.3.6 virtualenv-20.26.6
#13 DONE 4.8s

#14 [7/8] COPY host-x86_64/mingw-check/validate-toolstate.sh /scripts/
#14 DONE 0.0s
---
DirectMap4k:      198592 kB
DirectMap2M:    10287104 kB
DirectMap1G:     8388608 kB
##[endgroup]
Executing TIDY_PRINT_DIFF=1 python2.7 ../x.py test            --stage 0 src/tools/tidy tidyselftest --extra-checks=py:lint,cpp:fmt
+ TIDY_PRINT_DIFF=1 python2.7 ../x.py test --stage 0 src/tools/tidy tidyselftest --extra-checks=py:lint,cpp:fmt
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
downloading https://static.rust-lang.org/dist/2024-09-22/rustfmt-nightly-x86_64-unknown-linux-gnu.tar.xz
extracting /checkout/obj/build/cache/2024-09-22/rustfmt-nightly-x86_64-unknown-linux-gnu.tar.xz to /checkout/obj/build/x86_64-unknown-linux-gnu/rustfmt
---
fmt check
fmt: checked 5605 files
tidy check
tidy: Skipping binary file check, read-only filesystem
##[error]tidy error: /checkout/tests/ui/repr/16-bit-align-too-big.rs:8: line longer than 100 chars
removing old virtual environment
creating virtual environment at '/checkout/obj/build/venv' using 'python3.10'
Requirement already satisfied: pip in ./build/venv/lib/python3.10/site-packages (24.2)
All checks passed!
checking C++ file formatting
some tidy checks failed
some tidy checks failed
Command has failed. Rerun with -v to see more details.
  local time: Sat Oct  5 02:29:55 UTC 2024
  network time: Sat, 05 Oct 2024 02:29:55 GMT
##[error]Process completed with exit code 1.
Post job cleanup.