[llvm] [TableGen][DecoderEmitter] Change SmallSetVector to SetVector (NFC) (PR #159108)

[Sergei Barannikov via llvm-commits]

https://github.com/s-barannikov created https://github.com/llvm/llvm-project/pull/159108

SmallSetVector is too optimistic, there are usually more than 16 unique decoders and predicates. Modernize `typedef` to `using` while here.

>From b5b2b887dd36455d7b2bcf31b866f1ff447b3f17 Mon Sep 17 00:00:00 2001
From: Sergei Barannikov <barannikov88 at gmail.com>
Date: Tue, 16 Sep 2025 18:05:33 +0300
Subject: [PATCH] [TableGen][DecoderEmitter] Change SmallSetVector to SetVector
 (NFC)

SmallSetVector is too optimistic, there are usually more than 16 unique
decoders and predicates. Modernize `typedef` to `using` while here.
---
 llvm/utils/TableGen/DecoderEmitter.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/llvm/utils/TableGen/DecoderEmitter.cpp b/llvm/utils/TableGen/DecoderEmitter.cpp
index 4b04b33502d25..77bf60e14c9a8 100644
--- a/llvm/utils/TableGen/DecoderEmitter.cpp
+++ b/llvm/utils/TableGen/DecoderEmitter.cpp
@@ -160,8 +160,8 @@ class LessEncodingIDByWidth {
   }
 };
 
-typedef SmallSetVector<CachedHashString, 16> PredicateSet;
-typedef SmallSetVector<CachedHashString, 16> DecoderSet;
+using PredicateSet = SetVector<CachedHashString>;
+using DecoderSet = SetVector<CachedHashString>;
 
 class DecoderTable {
 public:
@@ -274,7 +274,7 @@ class DecoderEmitter {
   void emitInstrLenTable(formatted_raw_ostream &OS,
                          ArrayRef<unsigned> InstrLen) const;
   void emitPredicateFunction(formatted_raw_ostream &OS,
-                             PredicateSet &Predicates) const;
+                             const PredicateSet &Predicates) const;
   void emitDecoderFunction(formatted_raw_ostream &OS,
                            const DecoderSet &Decoders,
                            unsigned BucketBitWidth) const;
@@ -838,8 +838,8 @@ void DecoderEmitter::emitInstrLenTable(formatted_raw_ostream &OS,
   OS << "};\n\n";
 }
 
-void DecoderEmitter::emitPredicateFunction(formatted_raw_ostream &OS,
-                                           PredicateSet &Predicates) const {
+void DecoderEmitter::emitPredicateFunction(
+    formatted_raw_ostream &OS, const PredicateSet &Predicates) const {
   // The predicate function is just a big switch statement based on the
   // input predicate index.
   OS << "static bool checkDecoderPredicate(unsigned Idx, const FeatureBitset "