[clang] [Clang] Fix name lookup for dependent bases (PR #114978)

[via cfe-commits]

================
@@ -170,13 +170,21 @@ bool CXXBasePaths::lookupInBases(ASTContext &Context,
     QualType BaseType =
         Context.getCanonicalType(BaseSpec.getType()).getUnqualifiedType();
 
+    bool isCurrentInstantiation = isa<InjectedClassNameType>(BaseType);
+    if (!isCurrentInstantiation) {
+      if (auto *BaseRecord = cast_or_null<CXXRecordDecl>(
----------------
cor3ntin wrote:

```suggestion
      if (auto *BaseRecord = cast_if_present<CXXRecordDecl>(
```

Can this actually be null?

https://github.com/llvm/llvm-project/pull/114978
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