[llvm] [TableGen] Print a warning when a Processor contains duplicate Features / TuneFeatures (PR #137864)

[Craig Topper via llvm-commits]

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@@ -333,6 +333,30 @@ unsigned SubtargetEmitter::cpuNames(raw_ostream &OS) {
   return Names.size();
 }
 
+static void checkDuplicateCPUFeatures(StringRef CPUName,
+                                      ArrayRef<const Record *> Features,
+                                      ArrayRef<const Record *> TuneFeatures) {
+  // We had made sure each SubtargetFeature Record has a unique name, so we can
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topperc wrote:

had->have

https://github.com/llvm/llvm-project/pull/137864