[llvm] Revert "DAG: Preserve range metadata when load is narrowed" (PR #128948)

[Daniel Thornburgh via llvm-commits]

mysterymath wrote:

> @mysterymath Can you have point me to a testcase that fails without this reversion? I'd like to investigate it.

This wasn't a test failure; it caused a 2-stage clang build to fail.
See the message I left on the original PR: https://github.com/llvm/llvm-project/pull/128144#issuecomment-2686301411

https://github.com/llvm/llvm-project/pull/128948