[NFC][clang] Fix Coverity static analyzer tool concerns about auto_causes_copy
Reported by Coverity:
AUTO_CAUSES_COPY
Unnecessary object copies can affect performance
Inside FrontendActions.cpp file,
In clang::DumpModuleInfoAction::ExecuteAction(): Using the auto keyword without an & causes the copy of an object of type pair.
Inside ComputeDependence.cpp file,
In clang::computeDependence(clang::OverloadExpr *, bool, bool, bool): Using the auto keyword without an & causes the copy of an object of type TemplateArgumentLoc.
Reviewed By: erichkeane, aaron.ballman
Differential Revision: https://reviews.llvm.org/D147574