[DirectX] Fix crash in passes when building with LLVM_ENABLE_EXPENSIVE_CHECKS (#150483) fixes #148681 fixes #148680 For the scalarizer pass we just need to indicate that scalarization took place, I used the logic for knowing when to eraseFromParent to indicate this. For the DXILLegalizePass the new `legalizeScalarLoadStoreOnArrays` did not use `ToRemove` which means our uses of !ToRemove.empty(); was no longer correct. This meant each legalization now needed a means of indicated if a change was maded. For DXILResourceAccess.cpp the `Changed` bool was never set to true. So removed it and replaced it with `!Resources.empty();` since we only call `replaceAccess` if we have items in Resources.
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