ClangRefactoring: Don't update the database if something went wrong

We can get an compile error. In that case we should not update the
database. In the future we should have a mechanism to report about the
database state.

Task-number: QTCREATORBUG-21949
Change-Id: I203346d536b007171f7bf255047409431c44a85a
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/tools/clangrefactoringbackend/source/indexdataconsumer.h

@@ -55,12 +55,7 @@ public:
     bool handleDeclOccurence(const clang::Decl *declaration,
                              clang::index::SymbolRoleSet symbolRoles,
                              llvm::ArrayRef<clang::index::SymbolRelation> symbolRelations,
-#if LLVM_VERSION_MAJOR >= 7
                              clang::SourceLocation sourceLocation,
-#else
-                             clang::FileID fileId,
-                             unsigned offset,
-#endif
                              ASTNodeInfo astNodeInfo) override;
 
 private: