Add CFI directives to chacha-armv8.pl

[andrewhop]

Issues:

Addresses #2459

Description of changes:

Continuation of the fixes.

Call-outs:

This doesn't fix everything, something else is still messing up the stack for a few other calls which creates an issue for the C function:

Testing:

Before:

After:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.70%. Comparing base (67ef2bd) to head (481082d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2633      +/-   ##
==========================================
- Coverage   78.71%   78.70%   -0.02%     
==========================================
  Files         646      646              
  Lines      111213   111213              
  Branches    15711    15711              
==========================================
- Hits        87544    87527      -17     
- Misses      22975    22992      +17     
  Partials      694      694              

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