[Hexagon] Add missing operand when disassembling Y4_crswap10 (llvm#153849)

Auto-generated decoder fails to add the $sgp10 operand because it has no
encoding bits.
Work around this by adding the missing operand after decoding is
complete.

Fixes llvm#153829.

Author: s-barannikov

llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp

@@ -526,6 +526,9 @@ DecodeStatus HexagonDisassembler::getSingleInstruction(MCInst &MI, MCInst &MCB,
     MI.insert(MI.begin() + 1,
               MCOperand::createExpr(MCConstantExpr::create(-1, getContext())));
     break;
+  case Hexagon::Y4_crswap10:
+    MI.addOperand(MCOperand::createReg(Hexagon::SGP1_0));
+    break;
   default:
     break;
   }

llvm/test/MC/Hexagon/system-inst.s

@@ -89,6 +89,9 @@ crswap(r12,sgp0)
 #CHECK: 652dc000 { crswap(r13,sgp1) }
 crswap(r13,sgp1)
 
+#CHECK: 6d8ec000 { crswap(r15:14,s1:0) }
+crswap(r15:14,sgp1:0)
+
 #CHECK: 660fc00e { r14 = getimask(r15) }
 r14=getimask(r15)