Turn cl::values() (for enum) from a vararg function to using C++ variadic template

The core of the change is supposed to be NFC, however it also fixes
what I believe was an undefined behavior when calling:

 va_start(ValueArgs, Desc);

with Desc being a StringRef.

Differential Revision: https://reviews.llvm.org/D25342

llvm-svn: 283671
diff --git a/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp b/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
index c281f97..73346b9 100644
--- a/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -54,8 +54,7 @@
              clEnumValN(HWMultIntr, "interrupts",
                 "Assume hardware multiplier can be used inside interrupts"),
              clEnumValN(HWMultNoIntr, "use",
-                "Assume hardware multiplier cannot be used inside interrupts"),
-             clEnumValEnd));
+                "Assume hardware multiplier cannot be used inside interrupts")));
 
 MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
                                            const MSP430Subtarget &STI)