[clang-tools-extra] [clangd] Add background index format support to clangd-indexer (PR #175209)

[Jason Williams via cfe-commits]

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@@ -204,6 +184,31 @@ class BackgroundIndexActionFactory : public tooling::FrontendActionFactory {
     return Success;
   }
 
+protected:
+  void handleSymbols(SymbolSlab S) override {
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jasonwilliams wrote:

I've re-created a base class which uses unique_ptr now so both classes share the same mehods, this should be simplified a lot.

https://github.com/llvm/llvm-project/pull/175209