Revert "Reapply r291025 ("AMDGPU: Remove unneccessary intermediate vector")"

[alekseyshl]

Summary

This reverts commit r291144. It breaks build bots.

[alekseyshl]

Failing bots: http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/3270, http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer/builds/2058

lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

public:
   void setForcedEncodingSize(unsigned Size) { ForcedEncodingSize = Size; }
   void setForcedDPP(bool ForceDPP_) { ForcedDPP = ForceDPP_; }
   void setForcedSDWA(bool ForceSDWA_) { ForcedSDWA = ForceSDWA_; }
 
   unsigned getForcedEncodingSize() const { return ForcedEncodingSize; }
   bool isForcedVOP3() const { return ForcedEncodingSize == 64; }
   bool isForcedDPP() const { return ForcedDPP; }
   bool isForcedSDWA() const { return ForcedSDWA; }
-  ArrayRef<unsigned> getMatchedVariants() const;
 
   std::unique_ptr<AMDGPUOperand> parseRegister();
   bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc) override;
   unsigned checkTargetMatchPredicate(MCInst &Inst) override;
   unsigned validateTargetOperandClass(MCParsedAsmOperand &Op,
                                       unsigned Kind) override;
   bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                                OperandVector &Operands, MCStreamer &Out,
if (Inst.getOpcode() == AMDGPU::V_MAC_F32_sdwa_vi ||
     if (!Op.isImm() || Op.getImm() != AMDGPU::SDWA::SdwaSel::DWORD) {
       return Match_InvalidOperand;
     }
   }
 
   return Match_Success;
 }
 
-// What asm variants we should check
-ArrayRef<unsigned> AMDGPUAsmParser::getMatchedVariants() const {
-  if (getForcedEncodingSize() == 32) {
-    static const unsigned Variants[] = {AMDGPUAsmVariants::DEFAULT};
-    return Variants;
-  }
-
-  if (isForcedVOP3()) {
-    static const unsigned Variants[] = {AMDGPUAsmVariants::VOP3};
-    return Variants;
-  }
-
-  if (isForcedSDWA()) {
-    static const unsigned Variants[] = {AMDGPUAsmVariants::SDWA};
-    return Variants;
-  }
-
-  if (isForcedDPP()) {
-    static const unsigned Variants[] = {AMDGPUAsmVariants::DPP};
-  return Variants;
-  }
-
-  static const unsigned Variants[] = {
-    AMDGPUAsmVariants::DEFAULT, AMDGPUAsmVariants::VOP3,
-    AMDGPUAsmVariants::SDWA, AMDGPUAsmVariants::DPP
-  };
-
-  return Variants;
-}
-
 bool AMDGPUAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                                               OperandVector &Operands,
                                               MCStreamer &Out,
                                               uint64_t &ErrorInfo,
                                               bool MatchingInlineAsm) {
+  // What asm variants we should check
+  std::vector<unsigned> MatchedVariants;
+  if (getForcedEncodingSize() == 32) {
+    MatchedVariants = {AMDGPUAsmVariants::DEFAULT};
+  } else if (isForcedVOP3()) {
+    MatchedVariants = {AMDGPUAsmVariants::VOP3};
+  } else if (isForcedSDWA()) {
+    MatchedVariants = {AMDGPUAsmVariants::SDWA};
+  } else if (isForcedDPP()) {
+    MatchedVariants = {AMDGPUAsmVariants::DPP};
+  } else {
+    MatchedVariants = {AMDGPUAsmVariants::DEFAULT,
+                       AMDGPUAsmVariants::VOP3,
+                       AMDGPUAsmVariants::SDWA,
+                       AMDGPUAsmVariants::DPP};
+  }
+
   MCInst Inst;
   unsigned Result = Match_Success;
-  for (auto Variant : getMatchedVariants()) {
+  for (auto Variant : MatchedVariants) {
     uint64_t EI;
     auto R = MatchInstructionImpl(Operands, Inst, EI, MatchingInlineAsm,
                                   Variant);
     // We order match statuses from least to most specific. We use most specific
     // status as resulting
     // Match_MnemonicFail < Match_InvalidOperand < Match_MissingFeature < Match_PreferE32
     if ((R == Match_Success) ||
         (R == Match_PreferE32) ||
void AMDGPUAsmParser::cvtSDWA(MCInst &Inst, const OperandVector &Operands,
   const MCInstrDesc &Desc = MII.get(Inst.getOpcode());
   for (unsigned J = 0; J < Desc.getNumDefs(); ++J) {
     ((AMDGPUOperand &)*Operands[I++]).addRegOperands(Inst, 1);
   }
 
   for (unsigned E = Operands.size(); I != E; ++I) {
     AMDGPUOperand &Op = ((AMDGPUOperand &)*Operands[I]);
     // Add the register arguments
-    if ((BasicInstType == SIInstrFlags::VOPC ||
+    if ((BasicInstType == SIInstrFlags::VOPC || 
          BasicInstType == SIInstrFlags::VOP2)&&
         Op.isReg() &&
         Op.Reg.RegNo == AMDGPU::VCC) {
       // VOPC and VOP2b (v_add_u32, v_sub_u32 ...) sdwa use "vcc" token as dst.
       // Skip it.
       continue;
     } else if (isRegOrImmWithInputMods(Desc, Inst.getNumOperands())) {
       Op.addRegOrImmWithInputModsOperands(Inst, 2);