[Chapel Merge] Annotate arkouda build time deltas

Branch: refs/heads/main
Revision: ddffb27ca53046589c3c33e598e1e6d4ace72179
Author: bradcray
Link: Annotate arkouda build time deltas by bradcray · Pull Request #29107 · chapel-lang/chapel · GitHub
Log Message:
Annotate arkouda build time deltas (#29107)

[reviewed by @benharsh]

This annotates a recent downtick and uptick we saw in build times when
switching to LLVM 22, which wasn't supported by Chapel 2.8, requiring
Arkouda-release perf testing to use the bundled version which happens to
be built with better optimization levels and therefore runs faster,
reducing compile times. Once Arkouda release testing was updated to 2.9,
the system LLVM was used again (albeit version 22 rather than the
previous 21), largely restoring the previous times.

Compare: Comparing b657bea5ab1bc756516666ff92e7883538c85dc0...1b9638a7717ebe9c90427ca2e9d1c3168bee721e · chapel-lang/chapel · GitHub

Diff:
M test/ANNOTATIONS.yaml
https://github.com/chapel-lang/chapel/pull/29107.diff