[llvm] [LLVM][TableGen] Check name conflicts between target dep and independent intrinsics (PR #109826)

[Matt Arsenault via llvm-commits]

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@@ -101,6 +102,28 @@ void CodeGenIntrinsicTable::CheckDuplicateIntrinsics() const {
   PrintFatalNote(First.TheDef, "Previous definition here");
 }
 
+// For target independent intrinsics, check that their second dotted component
+// does not match any target name.
+void CodeGenIntrinsicTable::CheckTargetIndependentIntrinsics() const {
+  SmallDenseSet<StringRef> TargetNames;
+  for (const auto &Target : ArrayRef(Targets).drop_front())
+    TargetNames.insert(Target.Name);
+
+  // Set of target independent intrinsics.
+  const auto &Set = Targets[0];
+  for (const auto &Int : ArrayRef(&Intrinsics[Set.Offset], Set.Count)) {
+    StringRef Name = Int.Name;
+    StringRef Prefix = Name.drop_front(5).split('.').first;
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arsenm wrote:

Maybe use consume_front("llvm.") 

https://github.com/llvm/llvm-project/pull/109826