GH-45132: [C++][Gandiva] Update LLVM to 18.1#45114

Merged

kou merged 9 commits intoapache:mainfrom lriggs:apache_main_lriggs

Feb 3, 2025

+8-8

Commits on Jan 24, 2025

apacheGH-45132 Upgrade LLVM to 18.1 which fixes the unexported orc symbol issu.
lriggs
committed

Commits on Jan 27, 2025

Commits on Jan 28, 2025

Not sure why windows machines don't like the patch file. Try removing the blank line to see if that helps.
lriggs
committed
Add back space to ports.patch file to match previous format.
lriggs
committed

Commits on Jan 30, 2025

Don't need llvm 18 here
lriggs
committed

Commits on Feb 3, 2025