[clang] [lldb] [clang] implement CWG1980 and CWG2064: instantiation-dependency improvements (PR #190495)

[via cfe-commits]

================
@@ -64,6 +64,19 @@ namespace cwg2061 { // cwg2061: 2.7
 #endif // C++11
 } // namespace cwg2061
 
+namespace cwg2064 { // cwg2064: 23
----------------
h-vetinari wrote:

```suggestion
namespace cwg2064 { // cwg2064: 24
```

https://github.com/llvm/llvm-project/pull/190495