[Subtarget] Create a separate SubtargetSubtargetKV struct for ProcDesc to remove fields from the stack tables that aren't needed for CPUs

The description for CPUs was just the CPU name wrapped with "Select the " and " processor". We can just do that directly in the help printer instead of making a separate version in the binary for each CPU.

Also remove the Value field that isn't needed and was always 0.

Differential Revision: https://reviews.llvm.org/D58938

llvm-svn: 355429
diff --git a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp b/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
index 7b29b68..c0520a9 100644
--- a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
+++ b/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
@@ -16,7 +16,7 @@
 
 TargetSubtargetInfo::TargetSubtargetInfo(
     const Triple &TT, StringRef CPU, StringRef FS,
-    ArrayRef<SubtargetFeatureKV> PF, ArrayRef<SubtargetFeatureKV> PD,
+    ArrayRef<SubtargetFeatureKV> PF, ArrayRef<SubtargetSubTypeKV> PD,
     const SubtargetInfoKV *ProcSched, const MCWriteProcResEntry *WPR,
     const MCWriteLatencyEntry *WL, const MCReadAdvanceEntry *RA,
     const InstrStage *IS, const unsigned *OC, const unsigned *FP)