[llvm] [TableGen] Add support for sparse direct-lookup tables (PR #201158)

[Igor Wodiany via llvm-commits]

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@@ -860,6 +937,9 @@ void SearchableTableEmitter::run(raw_ostream &OS) {
         Table, IndexRec->getValue("Key"), IndexRec->getName(),
         IndexRec->getValueAsListOfStrings("Key"),
         IndexRec->getValueAsBit("EarlyOut"), /*ReturnRange*/ false));
+
+    // Sparse tables with secondary search indices are not supported.
+    Table.AllowSparseTable = false;
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IgWod wrote:

I have added a test for it and also a general test for the new lookup type.

https://github.com/llvm/llvm-project/pull/201158