Remove panic::Location::<'a>::caller from skippable functions

[adpaco]

Description of changes:

Remove panic::Location::<'a>::caller from the list of functions to skip.

In #376 it was implemented as codegen_unimplemented_intrinsic. #374 is open for handling it.

Resolved issues:

Resolves #205

Call-outs:

Waiting for std-lib-regression.sh to be fixed in #593 so CI shows no issues with std-lib codegen.

Testing:

• How is this change tested? Running std-lib-regression.sh with changes similar to Fix std lib regression script (#109 and #375) #593

• Is this a refactor change? No

Checklist

• Each commit message has a non-empty body, explaining why the change was made
• Methods or procedures are documented
• Regression or unit tests are included, or existing tests cover the modified code
• My PR is restricted to a single feature or bugfix

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