[clang] [clang][bytecode] Disallow reading from non-constant, array-typed `CompoundLiteralExpr`s (PR #195675)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

I'm referring to the AST, not constant evaluation.  I think we need a CompoundLiteralDecl or something like that.

https://github.com/llvm/llvm-project/pull/195675