remove few dead or unneeded codes [pr] (#14275)

tinygrad/codegen/opt/postrange.py

@@ -220,7 +220,7 @@ class Scheduler:
   def _apply_tc_opt(self, use_tensor_cores:int, axis:int, tc_select:int, opt_level:int) -> None|list[UOp]:
     if not (reduceops := self.reduceops): raise KernelOptError("no reduce ops for TensorCore")
     reduceop = reduceops[0]
-    if use_tensor_cores and reduceop is not None and reduceop.arg is Ops.ADD:
+    if use_tensor_cores and reduceop.arg is Ops.ADD:
       mul = reduceop.src[0] if reduceop.src[0].op is not Ops.CAST else reduceop.src[0].src[0]
       if mul.op is not Ops.MUL: return None
       in0, in1 = mul.src

tinygrad/engine/jit.py

@@ -323,7 +323,6 @@ class TinyJit(Generic[ReturnType]):
         try:
           ret = self.fxn(*args, **kwargs)
           if len(params:=get_parameters(ret)): Tensor.realize(params[0], *params[1:])
-        except Exception as e: raise e
         finally: capturing.clear()
       jit_cache = self._jit_cache
       del self._buffer_replace, self._jit_cache

tinygrad/uop/ops.py

@@ -308,12 +308,11 @@ class UOp(OpMixin, metaclass=UOpMetaClass):
     for er in self.ended_ranges:
       if er.op is Ops.RANGE:
         # if it's a single RANGE, we don't flow through it.
-        if er in ret: del ret[er]
+        ret.pop(er, None)
       else:
         # if it's not a RANGE, we include all ranges in srcs.
         # technically we shouldn't flow through these ranges either, but this is pre pm_add_control_flow so it's the same.
-        for s in er.ranges:
-          if s in ret: del ret[s]
+        for s in er.ranges: ret.pop(s, None)
     return ret
 
   @property