[SYCLomatic] Refactor infrastructure to run analysis pass before migration pass (#89)

Signed-off-by: Ziran Zhang <[email protected]>

Author: ziranzha

clang/include/clang/Frontend/MultiplexConsumer.h

@@ -77,6 +77,13 @@ class MultiplexConsumer : public SemaConsumer {
   void InitializeSema(Sema &S) override;
   void ForgetSema() override;
 
+#ifdef SYCLomatic_CUSTOMIZATION
+  void HandleCXXExplicitFunctionInstantiation(
+      const FunctionDecl *Specialization, const FunctionTypeLoc &FTL,
+      const ParsedAttributes &Attrs,
+      const TemplateArgumentListInfo &TAList) override;
+#endif // SYCLomatic_CUSTOMIZATION
+
 private:
   std::vector<std::unique_ptr<ASTConsumer>> Consumers; // Owns these.
   std::unique_ptr<MultiplexASTMutationListener> MutationListener;