[clang] [llvm] [DSE] Make DSE eliminate stores to objects with a sized dead_on_return (PR #173694)

[Henrik G. Olsson via cfe-commits]

hnrklssn wrote:

@boomanaiden154 We're seeing the assert introduced in this PR fail in Green Dragon: https://ci.swift.org/job/llvm.org/job/test-suite-verify-machineinstrs-x86_64h-O3/5854/

https://github.com/llvm/llvm-project/pull/173694