_mapper_info() fails if non-mapper entity

this is a 1.1 regression:

from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()


class A(Base):
    __tablename__ = 'a'
    id = Column(Integer, primary_key=True)

    x = Column(Integer)

e = create_engine("sqlite://", echo=True)
Base.metadata.create_all(e)


s = Session(e)
s.query(A.x).update(dict(x=5))

Traceback (most recent call last):
  File "test.py", line 19, in <module>
    s.query(A.x).update(dict(x=5))
  File "/home/classic/dev/sqlalchemy/lib/sqlalchemy/orm/query.py", line 3286, in update
    update_op.exec_()
  File "/home/classic/dev/sqlalchemy/lib/sqlalchemy/orm/persistence.py", line 1162, in exec_
    self._do_pre_synchronize()
  File "/home/classic/dev/sqlalchemy/lib/sqlalchemy/orm/persistence.py", line 1216, in _do_pre_synchronize
    target_cls = query._mapper_zero().class_
  File "/home/classic/dev/sqlalchemy/lib/sqlalchemy/orm/query.py", line 294, in _mapper_zero
    return self._entities[0].mapper
AttributeError: '_ColumnEntity' object has no attribute 'mapper'

either update() didn't call _mapper_zero() before or probably this is part of 81bd994c0adf43eb158a533b605c011fb552dd50 or related.

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