[Chapel Merge] Update GPU technote and llvmMoved test

Branch: refs/heads/main
Revision: 8606996571f8e826ce60a6972e1fd8820004c27f
Author: jabraham17
Link: Update GPU technote and llvmMoved test by jabraham17 · Pull Request #25081 · chapel-lang/chapel · GitHub
Log Message:
Update GPU technote and llvmMoved test (#25081)

Update the GPU technote and llvmMoved test for GPUs to reflect LLVM 18
support

[Reviewed by @stonea]

Compare: Comparing 0afff8725c5dbce57a8879f4e89b288863a52174...3699c205bd388a1495189e6d34db0bea6c9c5052 · chapel-lang/chapel · GitHub

Diff:
M doc/rst/technotes/gpu.rst
M test/gpu/native/llvmMoved.chpl
https://github.com/chapel-lang/chapel/pull/25081.diff