[llvm] Fix for logic in combineExtract() (PR #108208)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

ok, I think I get it now: there is a special check for this in each of the different handlings that would follow a BITCAST handling, so that should not be a problem. Patch updated per your suggestion.

https://github.com/llvm/llvm-project/pull/108208