Add StatusText to the Processor class in Target.td to allow adding 'experimental' or 'highly experimental' annotations to processors.

[dsanders]

The follow-on which uses the StatusText field is at http://reviews.llvm.org/D3569

[dsanders]

• Do without the ability to mark CPU's as experimental for the moment. This removes the dependency on D3568

[dsanders]

Undo the last change. I meant to update D3569 instead of D3568. Sorry for the noise.

include/llvm/Target/Target.td

class Processor<string n, ProcessorItineraries pi, list<SubtargetFeature> f> {
   SchedMachineModel SchedModel = NoSchedModel;
 
   // ProcItin - The scheduling information for the target processor.
   //
   ProcessorItineraries ProcItin = pi;
 
   // Features - list of
   list<SubtargetFeature> Features = f;
+
+  // StatusText - Text about the implementation status of the processor.
+  // When empty the help text will be 'Select the foo processor'. When non-empty
+  // it will be appended to the help text inside square brackets. For example,
+  // 'Select the foo processor [experimental]'
+  string StatusText = "";
 }
 
 // ProcessorModel allows subtargets to specify the more general
 // SchedMachineModel instead if a ProcessorItinerary. Subtargets will
 // gradually move to this newer form.
 //
 // Although this class always passes NoItineraries to the Processor
 // class, the SchedMachineModel may still define valid Itineraries.

utils/TableGen/SubtargetEmitter.cpp

unsigned SubtargetEmitter::CPUKeyValues(raw_ostream &OS) {
   // For each processor
   for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
     // Next processor
     Record *Processor = ProcessorList[i];
 
     const std::string &Name = Processor->getValueAsString("Name");
     const std::vector<Record*> &FeatureList =
       Processor->getValueAsListOfDefs("Features");
+    const std::string &StatusText = Processor->getValueAsString("StatusText");
 
     // Emit as { "cpu", "description", f1 | f2 | ... fn },
     OS << "  { "
        << "\"" << Name << "\", "
-       << "\"Select the " << Name << " processor\", ";
+       << "\"Select the " << Name << " processor";
+    if (!StatusText.empty())
+      OS << " [" << StatusText << "]";
+    OS << "\", ";
 
     if (FeatureList.empty()) {
       OS << "0ULL";
     } else {
       for (unsigned j = 0, M = FeatureList.size(); j < M;) {
         OS << Target << "::" << FeatureList[j]->getName();
         if (++j < M) OS << " | ";
       }