Example:

  (zero_extract:DI (reg:SI)
                   (const_int 24)
                   (const_int 0))

-->

  (and:DI (subreg:DI (lshiftrt:SI (reg:SI) (const_int 8))
                     0)
          (const_int 16777215))


2016-12-12  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* combine.c (change_zero_ext): Handle mode expanding zero_extracts.

From-SVN: r243578