[clang] [clang][Dependency Scanning] Refactor Scanning Compiler Instance Initialization (PR #161300)

[Qiongsi Wu via cfe-commits]

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@@ -453,24 +580,41 @@ bool DependencyScanningAction::runInvocation(
             ScanInstance.getPreprocessorOpts().ImplicitPCHInclude, ScanInstance,
             ScanInstance.getHeaderSearchOpts().PrebuiltModuleFiles,
             PrebuiltModulesASTMap, ScanInstance.getDiagnostics(), StableDirs))
-      return false;
+      return {};
 
-  // Create the dependency collector that will collect the produced
-  // dependencies.
-  //
-  // This also moves the existing dependency output options from the
+  return PrebuiltModulesASTMap;
+}
+
+std::unique_ptr<DependencyOutputOptions>
+getDependencyOutputOptions(CompilerInstance &ScanInstance) {
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qiongsiwu wrote:

Good point! Renamed. 

https://github.com/llvm/llvm-project/pull/161300