[clang] Implement constexpr DesignatedInitUpdateExpr. (#196427) DesignatedInitUpdateExpr exists to handle some obscure edge cases in C, where the usual InitListExpr canonicalization can't be performed. Previously, we didn't need constant evaluation for this, but C23 constexpr means we need to evaluate this before codegen. Implementation is mostly straightforward: just need to evaluate the two subexpressions, in order, and skip any NoInitExprs. Along the way, I ran into an issue with the way we manage array APValues for non-bytecode constant evaluation; fix reallocation to work correctly. Fixes #193373. Fixes #196450.
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