Remove custom gate handling from QASM2 emission logic

Author: zhenrongliew

src/bloqade/qasm2/emit/target.py

@@ -124,29 +124,6 @@ def emit(self, entry: ir.Method) -> ast.MainProgram:
         extra = []
         if self.qelib1:
             extra.append(ast.Include("qelib1.inc"))
-        if self.custom_gate:
-            cg = CallGraph(entry)
-
-            for _, fns in cg.defs.items():
-                if len(fns) != 1:
-                    raise ValueError("Incorrect callgraph")
-
-                (fn,) = fns
-                if fn is entry:
-                    continue
-
-                fn = fn.similar()
-                QASM2Fold(fn.dialects).fixpoint(fn)
-
-                # if not self.allow_global:
-                #     # rewrite global to parallel
-                #     GlobalToParallel(dialects=fn.dialects)(fn)
-
-                # if not self.allow_parallel:
-                #     # rewrite parallel to uop
-                #     ParallelToUOp(dialects=fn.dialects)(fn)
-
-                Py2QASM(fn.dialects)(fn)
 
         main_program.statements = extra + main_program.statements
         return main_program