I am not sure what this patch would accomplish. I tried
$ cat t.py 
def f():
    return 1
    1+2
from dis import dis
print dis(f)

Both with and without patch I get

$ ./python.exe -O t.py
  2           0 LOAD_CONST               1 (1)
              3 RETURN_VALUE        

  3           4 LOAD_CONST               1 (1)
              7 LOAD_CONST               2 (2)
             10 BINARY_ADD          
             11 POP_TOP             
None

I am sure I am missing something, but it is hard to tell what without 
any use cases provided.