[bp] Use getExecutionEngine to obtain the JIT for Cling > LLVM16

[aaronj0]

No description provided.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.27%. Comparing base (91e392d) to head (0a0d35d).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #331      +/-   ##
==========================================
+ Coverage   73.38%   74.27%   +0.89%     
==========================================
  Files           8        8              
  Lines        2979     3188     +209     
==========================================
+ Hits         2186     2368     +182     
- Misses        793      820      +27     

Files with missing lines	Coverage Δ
lib/Interpreter/Compatibility.h	89.71% <ø> (+1.05%)	⬆️

... and 6 files with indirect coverage changes

Files with missing lines	Coverage Δ
lib/Interpreter/Compatibility.h	89.71% <ø> (+1.05%)	⬆️

... and 6 files with indirect coverage changes

[aaronj0]

Closing as #330 has been merged, and a new tag has been cut for ROOT