Merge pull request #3431 from bjorn3/remove_sarg_t

Remove the sarg_t type and dummy_sarg_t instruction

cranelift/codegen/src/isa/aarch64/lower_inst.rs

@@ -3560,8 +3560,6 @@ pub(crate) fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
             panic!("ALU+imm and ALU+carry ops should not appear here!");
         }
 
-        Opcode::DummySargT => unreachable!(),
-
         Opcode::Iabs => {
             let rd = get_output_reg(ctx, outputs[0]).only_reg().unwrap();
             let rn = put_input_in_reg(ctx, inputs[0], NarrowValueMode::None);

cranelift/codegen/src/isa/s390x/lower.rs

@@ -2895,7 +2895,6 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
         | Opcode::AdjustSpDown
         | Opcode::AdjustSpUpImm
         | Opcode::AdjustSpDownImm
-        | Opcode::DummySargT
         | Opcode::IfcmpSp => {
             panic!("Unused opcode should not be encountered.");
         }

cranelift/codegen/src/isa/x64/lower.rs

@@ -6870,8 +6870,7 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
         | Opcode::AdjustSpUpImm
         | Opcode::AdjustSpDownImm
         | Opcode::IfcmpSp
-        | Opcode::Copy
-        | Opcode::DummySargT => {
+        | Opcode::Copy => {
             panic!("Unused opcode should not be encountered.");
         }