Fix an error introduced in #138518 (#142988)
CXXParenListInitExpr arguments would lose casts leading to incorrect types being used (e.g. only 32 bits of a 64 bit value being initialized). See https://github.com/llvm/llvm-project/pull/138518#issuecomment-2906276916 and https://github.com/llvm/llvm-project/pull/138518#issuecomment-2944538713 for details and context.
