one call to hc opt (#12074)

* one call to hc opt

* does that pass?

* Clean up postrange.py by removing comments

tinygrad/codegen/opt/postrange.py

@@ -325,8 +325,7 @@ def apply_opts(ctx:Renderer, ast:UOp):
     from tinygrad.codegen.opt.heuristic import hand_coded_optimizations
     # NOTE: hand_coded_optimizations doesn't support multiblock opts yet
     if all(len(u.src) == 1 for u in ast.parents if u.op is Ops.LOAD):
-      # TODO: why is the returned k from hand_coded_optimizations different than this?
-      for opt in hand_coded_optimizations(k).applied_opts: k.apply_opt(opt)
+      k = hand_coded_optimizations(k)
   return k.get_optimized_ast(name_override=ast.arg.name if ast.arg is not None and ast.arg.name != "test" else None)
 
 pm_postrange_opt = PatternMatcher([