Update to llvm 18

[edg-l]

No description provided.

[github-actions]

Benchmarking factorial

Compiling factorial (factorial.con)
Finished release in 30.012453ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 59.35 ms
Rust Result = 2432902008176640000 Time taken : 60.10 ms

Benchmarking fib

Compiling fib (fib.con)
Finished release in 26.286209ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 135.90 ms
Rust Result = 6765 Time taken : 85.36 ms

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.61905% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 58.39%. Comparing base (bd9ab01) to head (377e446).

Files	Patch %	Lines
crates/concrete_driver/src/lib.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   58.22%   58.39%   +0.17%     
==========================================
  Files          34       25       -9     
  Lines        4318     4218     -100     
==========================================
- Hits         2514     2463      -51     
+ Misses       1804     1755      -49     

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