[llvm] [X86][tablgen] Auto-gen broadcast tables (PR #73654)

[Simon Pilgrim via llvm-commits]

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@@ -508,19 +610,28 @@ void X86FoldTablesEmitter::updateTables(const CodeGenInstruction *RegInst,
           isMemoryOperand(MemOpRec)) {
         switch (I) {
         case 0:
+          assert(!IsBroadcast && "BroadcastTable0 needs to be added");
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RKSimon wrote:

What's stopping us adding BroadcastTable0?

https://github.com/llvm/llvm-project/pull/73654