[llvm] [InstCombine] Remove redundant alignment assumptions. (PR #123348)

[Florian Hahn via llvm-commits]

fhahn wrote:

Failures are 

> lldb-api.commands/expression/import-std-module/vector-dbg-info-content/TestDbgInfoContentVectorFromStdModule.py
> lldb-api.commands/expression/import-std-module/vector-of-vectors/TestVectorOfVectorsFromStdModule.py

which seem broken in Linux Precommit CI for the last few days consistently

https://github.com/llvm/llvm-project/pull/123348