[LLParser] Remove redundant code (NFC) (#120478)

Author: pedroclobo

llvm/lib/AsmParser/LLParser.cpp

@@ -7796,12 +7796,10 @@ bool LLParser::parseCast(Instruction *&Inst, PerFunctionState &PFS,
  parseType(DestTy))
  return true;
 
- if (!CastInst::castIsValid((Instruction::CastOps)Opc, Op, DestTy)) {
- CastInst::castIsValid((Instruction::CastOps)Opc, Op, DestTy);
+ if (!CastInst::castIsValid((Instruction::CastOps)Opc, Op, DestTy))
  return error(Loc, "invalid cast opcode for cast from '" +
  getTypeString(Op->getType()) + "' to '" +
  getTypeString(DestTy) + "'");
- }
  Inst = CastInst::Create((Instruction::CastOps)Opc, Op, DestTy);
  return false;
 }