Adopt metrics to changes introduced by LLVM 3.8

CMakeLists.txt

bin/calc-mccabe.cpp

bin/call-stack.cpp

bin/find-inputs.cpp

bin/is-recursive.cpp

bin/loop-stats.cpp

bin/metrics.cpp

bin/uses-fptr.cpp

bin/uses-fpu.cpp

lib/FInputsPass.cpp

lib/FInputsPass.h

lib/LoopStatsPass.cpp

lib/LoopStatsPass.h

lib/McCabePass.cpp

lib/printing/CallStackPrinter.h

lib/printing/FInputPrinter.h

lib/printing/FunctionPointerPrinter.h

lib/printing/LoopStatsPrinter.h

lib/printing/RecursionPrinter.h