[clang-tools-extra] [clang][include-cleaner] Support ObjC @selector expressions in WalkAST (PR #212564)

[via cfe-commits]

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@@ -38,6 +41,14 @@ class NamedDecl;
 class SourceLocation;
 namespace include_cleaner {
 
+using ObjCSelectorMap =
+    llvm::DenseMap<Selector, llvm::SmallVector<NamedDecl *, 2>>;
+
+/// Builds a map from Objective-C Selectors to their declarations in the given
+/// ASTContext.
+/// This is used to optimize selector lookups during AST walking.
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dmaclach wrote:

Was removed with revamp.

https://github.com/llvm/llvm-project/pull/212564