Revert "dialects (arm): add LabelAttr (#3745)" (#3746)

This reverts commit 64f809b. (Removes
LabelAttr)

tests/test_assembly_arg_str.py

@@ -1,7 +1,6 @@
 import pytest
 
 from xdsl.dialects.arm.assembly import assembly_arg_str
-from xdsl.dialects.arm.attrs import LabelAttr
 from xdsl.dialects.arm.register import IntRegisterType
 from xdsl.dialects.test import TestType
 from xdsl.utils.test_value import TestSSAValue
@@ -12,11 +11,6 @@ def test_assembly_arg_str_ARMRegister():
     assert assembly_arg_str(arg) == "x0"
 
 
-def test_assembly_arg_str_LabelAttr():
-    arg = LabelAttr("main")
-    assert assembly_arg_str(arg) == "main"
-
-
 def test_assembly_arg_str_SSAValue_valid():
     arg = TestSSAValue(IntRegisterType("x1"))
     assert assembly_arg_str(arg) == "x1"

xdsl/dialects/arm/assembly.py

@@ -4,9 +4,7 @@
 from xdsl.dialects.builtin import StringAttr
 from xdsl.ir import SSAValue
 
-from .attrs import LabelAttr
-
-AssemblyInstructionArg: TypeAlias = ARMRegisterType | LabelAttr | SSAValue
+AssemblyInstructionArg: TypeAlias = ARMRegisterType | SSAValue
 
 
 def append_comment(line: str, comment: StringAttr | None) -> str:
@@ -22,9 +20,6 @@ def assembly_arg_str(arg: AssemblyInstructionArg) -> str:
     if isinstance(arg, ARMRegisterType):
         reg = arg.register_name
         return reg
-    elif isinstance(arg, LabelAttr):
-        label = arg.data
-        return label
     else:  # SSAValue
         if isinstance(arg.type, ARMRegisterType):
             reg = arg.type.register_name