Rollback vector shuffle sinking functionality

Rollback part of the functionality as it is not fully functional yet

(cherry picked from commit a107ef6)

Author: admitric

IGC/Compiler/CISACodeGen/CodeSinking.cpp

@@ -1991,7 +1991,7 @@ namespace IGC {
             if (CurrentCandidateInsts.size() > 0 &&
                 Id == GenISAIntrinsic::GenISA_LSC2DBlockReadAddrPayload)
             {
-                if (!SinkFromPH && !allUsesAreDominatedByUndoPoint(CurrentCandidateInsts, CurrentCandidateInsts[0]))
+                if (!SinkFromPH && !allUsesAreDominatedByUndoPoint(CurrentCandidateInsts, CurrentCandidateInsts[0]->getNextNode()))
                 {
                     PrintDump(VerbosityLevel::High, "Not all the uses are dominated by the UndoPoint, skipping.\n");
                     return false;
@@ -2229,7 +2229,7 @@ namespace IGC {
         }
 
         DenseMap<InsertElementInst *, InstSet> DestVecToShuffleInst;
-        SmallVector<Candidate, 16> ShuffleCandidates;
+        CandidateVec ShuffleCandidates;
         DenseMap<Instruction *, Candidate *> ShuffleInstToCandidate;
 
         for (auto &VecIEs : SourceVectors)
@@ -2279,12 +2279,12 @@ namespace IGC {
                     PrintDump(VerbosityLevel::Medium, "DestVector used in the loop:\n");
                     PrintInstructionDump(VerbosityLevel::Medium, DestVec);
 
-                    ShuffleCandidates.emplace_back(InstrVec{}, TgtBB, SinkFromPH ? LoopSinkWorthiness::Sink : LoopSinkWorthiness::IntraLoopSink, nullptr);
+                    ShuffleCandidates.push_back(std::make_unique<Candidate>(InstrVec{}, TgtBB, SinkFromPH ? LoopSinkWorthiness::Sink : LoopSinkWorthiness::IntraLoopSink, nullptr));
                     Changed = true;
 
                     for (Instruction *I : ShuffleInst)
                     {
-                        ShuffleInstToCandidate[I] = &ShuffleCandidates.back();
+                        ShuffleInstToCandidate[I] = ShuffleCandidates.back().get();
                     }
                 }
             }

IGC/Compiler/tests/CodeSinking/LoopSinking/2d-blockload-vectorschuffle-sch.ll

@@ -9,6 +9,9 @@
 ; REQUIRES: regkeys, llvm-14-plus
 ; RUN: igc_opt --opaque-pointers -platformpvc --regkey LoopSinkMinSave=1 --regkey LoopSinkAvoidSplittingDPAS=0 --regkey LoopSinkEnable2dBlockReads=1 --regkey LoopSinkEnableLoadsRescheduling=1 --regkey ForceLoopSink=1 --regkey CodeLoopSinkingMinSize=10 --regkey CodeSinkingLoadSchedulingInstr=1 --regkey LoopSinkCoarserLoadsRescheduling=0 --regkey LoopSinkEnableVectorShuffle=1 %enable-basic-aa% --igc-code-loop-sinking -S %s 2>&1 | FileCheck %s
 
+; The functionality is not functional yet, so we expect the test to fail
+; XFAIL: *
+
 define spir_kernel void @foo(ptr addrspace(1) %_arg_A, ptr addrspace(1) %_arg_B, i16 %localIdY) {
 ; Check that the order of the first loads and SetField calls is not changed after rollback
 ; CHECK-LABEL: @foo(