[clang] [CIR] Const member expr for struct type (PR #164172)

[Amr Hesham via cfe-commits]

AmrDeveloper wrote:

CompoundLiteralExpr is now upstreamed from @mmha PR, so I updated the PR to add one test case and also address const member expr

@andykaylor 

https://github.com/llvm/llvm-project/pull/164172