[NVPTX] Fold symbol addresses into memory operands (reland) (#205983)
Re-lands https://github.com/llvm/llvm-project/pull/202379, which was
reverted in https://github.com/llvm/llvm-project/pull/205852. The test
failures were introduced because the original PR was stale after
#204192, so I've updated the test in here.
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>