[clang] Consider array filler in MaybeElementDependentArrayfiller()

Any InitListExpr may have an array filler and since we may be evaluating
the array filler as well, we need to take into account that the array
filler expression might make the InitListExpr element dependent.

Fixes https://github.com/llvm/llvm-project/issues/56016

Differential Revision: https://reviews.llvm.org/D131155