[clang] [clang][DebugInfo] Don't mark explicit parameter of synthesized ObjC property accessors artificial (PR #164998)

[Adrian Prantl via cfe-commits]

================
@@ -0,0 +1,63 @@
+// Test that synthesized accessors get treated like regular method declarations/defeinitions.
----------------
adrian-prantl wrote:

```suggestion
// Test that synthesized accessors get treated like regular method declarations/definitions.
```

https://github.com/llvm/llvm-project/pull/164998