[clang] [clang] Introduce `SemaConcept` (PR #92672)

[via cfe-commits]

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@@ -989,6 +991,11 @@ class Sema final : public SemaBase {
     return *CodeCompletionPtr;
   }
 
+  SemaConcept &Concept() {
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cor3ntin wrote:

```suggestion
  SemaConcept &Concepts() {
```

https://github.com/llvm/llvm-project/pull/92672