Gate pointer alignment enforcement (bp #12176)

[mergify]

This is an automated backport of pull request #12176 done by Mergify

Cherry-pick of ae7b15f has failed:

On branch mergify/bp/v1.3/pr-12176
Your branch is up to date with 'origin/v1.3'.

You are currently cherry-picking commit ae7b15f06.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   programs/bpf/benches/bpf_loader.rs
	modified:   programs/bpf_loader/src/lib.rs
	modified:   programs/bpf_loader/src/syscalls.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   programs/bpf/tests/programs.rs

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[t-nelson]

@jackcmay 👋

[jackcmay]

Is clapping your new thing? ;-)

[t-nelson]

It's a 🌊, sir! 🙂

[codecov]

Codecov Report

Merging #12188 into v1.3 will decrease coverage by 0.0%.
The diff coverage is 29.5%.

@@           Coverage Diff            @@
##            v1.3   #12188     +/-   ##
========================================
- Coverage   82.2%    82.1%   -0.1%     
========================================
  Files        337      337             
  Lines      79564    79631     +67     
========================================
+ Hits       65430    65455     +25     
- Misses     14134    14176     +42