[clang][bytecode] Silently reject ctors of invalid decls (#128290)

The follow-up diagnostic would otherwise be:

array.cpp:111:33: note: undefined constructor '(unnamed struct at
array.cpp:111:11)' cannot be used in a constant expression
array.cpp:111:11: note: declared here
  111 | constexpr struct { Unknown U; } InvalidCtor;
      |           ^

... and complaining about the undefined constructor of a class that is
invalid anyway doesn't make much sense.

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