[Chapel Merge] Add missing 'override' in compiler/llvm

Branch: refs/heads/master
Revision: 3913e78
Author: vasslitvinov
Log Message:

Merge pull request #17165 from vasslitvinov/add-llvm-overrides

Add missing 'override' in compiler/llvm

These annotations were missed in #17150, preventing the compiler
from building with CHPL_LLVM=system.

Merging right away - aiming to avoid failures in nightly testing.
Requesting post-merge review.

Modified Files:
M compiler/llvm/clangUtil.cpp
M compiler/llvm/llvmAggregateGlobalOps.cpp
M compiler/llvm/llvmGlobalToWide.cpp

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