fixup! [AArch64][llvm] Armv9.7-A: Add support for SVE2p3 LUTI6 operations

The code in tryParseVectorList() should only apply to `luti6` instructions

Author: jthackray

llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

@@ -4882,11 +4882,13 @@ ParseStatus AArch64AsmParser::tryParseVectorList(OperandVector &Operands,
       FirstReg, Count, Stride, NumElements, ElementWidth, VectorKind, S,
       getLoc(), getContext()));
 
-  if (getTok().isNot(AsmToken::Comma)) {
-    ParseStatus Res = tryParseVectorIndex(Operands);
-    if (Res.isFailure())
-      return ParseStatus::Failure;
-    return ParseStatus::Success;
+  if (Mnemonic == "luti6") {
+    if (getTok().isNot(AsmToken::Comma)) {
+      ParseStatus Res = tryParseVectorIndex(Operands);
+      if (Res.isFailure())
+        return ParseStatus::Failure;
+      return ParseStatus::Success;
+    }
   }
 
   return ParseStatus::Success;