[DSE] Make DSE eliminate stores to objects with a sized dead_on_return dead_on_return is made optionally sized in #171712. This patch adds handling in DSE so that we can actually eliminate stores to pointer parameters marked with a sized dead_on_return attribute. We do not eliminate stores where the store may overlap with bytes that are not known to be dead after return. Reviewers: nikic, antoniofrighetto, alinas, aeubanks Pull Request: https://github.com/llvm/llvm-project/pull/173694
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