tests: adapt for removal of -opaque-pointers in LLVM 17 #113692
                
     Merged
            
            
          
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The commit llvm/llvm-project@53717ca removed the flag from LLVM.
Found via our experimental rust + LLVM@HEAD bot: https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/20777#01895454-40b2-4e2f-978b-1294a83e1cce