[clang] [Clang][Sema] Detect inline namespace ambiguity on namespace redefinition (PR #234689)

[Chen Miao via cfe-commits]

================
@@ -12077,8 +12077,20 @@ Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope,
       PrevNS = getStdNamespace();
       IsStd = true;
       AddToKnown = !IsInline;
+    } else if (R.isAmbiguous()) {
----------------
ChenMiaoi wrote:

What if it involves the global namespace `std`?

``` cc
namespace std { }
inline namespace B { namespace std {} }
namespace std {}
```

https://github.com/llvm/llvm-project/pull/234689
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