Fastcasing llvm builtins

[skrynski]

No description provided.

[o-]

Here are some stats for your PR:

• WARNING: the longest CI job test_release_2 took 2.27h
• fastaredux_naive regressed by 0.9
• binarytrees_naive regressed by 0.93
• reversecomplement_2 regressed by 0.94
• Overall benchmarks regressed by 1.0

Please find your performance results at https://rir-benchmarks.prl.fit.cvut.cz/diff?job_ids[]=6344531430&job_ids[]=6321490902&selection=all

[o-]

Here are some stats for your PR:

• WARNING: the longest CI job test_release_2 took 2.44h
• Bounce_nonames regressed by 0.94
• Overall benchmarks improved by 1.0

Please find your performance results at https://rir-benchmarks.prl.fit.cvut.cz/diff?job_ids[]=6366036007&job_ids[]=6359193308&selection=all