[Clang] Implement P2280R4 Using unknown pointers and references in constant expressions (#95474)

P2280R4 allows the use of references in pointers of unknown origins in a
constant expression context but only in specific cases that could be
constant expressions.

We track whether a variable is a constexpr unknown in a constant
expression by setting a flag in either APValue or LValue and using this
flag to prevent using unknown values in places where it is not allowed.

Fixes: https://github.com/llvm/llvm-project/issues/63139 https://github.com/llvm/llvm-project/issues/63117

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