[clang] [lld] [llvm] [WIP][IR][Constants] Change the semantic of `ConstantPointerNull` to represent an actual `nullptr` instead of a zero-value pointer (PR #166667)

[Shilei Tian via cfe-commits]

https://github.com/shiltian edited 
https://github.com/llvm/llvm-project/pull/166667
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