[clang] [Clang] [Sema] Fix dependence of DREs in lambdas with an explicit object parameter (PR #84473)

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Sirraide wrote:

> https://godbolt.org/z/WTTKfG1ha Looks like this is causing some assert failures. @Sirraide Thanks @jyu2-git for helping identifying the commit.

I think I might know what’s going on here: We probably have an `AttributedType` or some other form of sugar here; I’ll see if I can fix it and if it takes too long I’ll revert this and reapply it later.

https://github.com/llvm/llvm-project/pull/84473