Stop caching sysvars, instead load them ahead of time (backport #21108)

[mergify]

This is an automatic backport of pull request #21108 done by Mergify.
Cherry-pick of 29ad081 has failed:

On branch mergify/bp/v1.8/pr-21108
Your branch is up to date with 'origin/v1.8'.

You are currently cherry-picking commit 29ad08155.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   programs/bpf/tests/programs.rs
	both modified:   programs/bpf_loader/src/syscalls.rs
	both modified:   programs/stake/src/stake_instruction.rs
	both modified:   runtime/src/bank.rs
	both modified:   runtime/src/message_processor.rs
	both modified:   sdk/program/src/sysvar/mod.rs
	both modified:   sdk/src/process_instruction.rs

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.com

[solana-grimes]

😱 New commits were pushed while the automerge label was present.

[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #22466 (f799cd8) into v1.8 (05e75ae) will increase coverage by 0.0%.
The diff coverage is 84.6%.

@@           Coverage Diff           @@
##             v1.8   #22466   +/-   ##
=======================================
  Coverage    81.6%    81.6%           
=======================================
  Files         459      459           
  Lines      131185   131140   -45     
=======================================
- Hits       107049   107026   -23     
+ Misses      24136    24114   -22     

[github-actions]

This PR has been automatically locked since there has not been any activity in past 14 days after it was merged.