re PR rtl-optimization/64818 (User specified register don't work correctly in inline...

re PR rtl-optimization/64818 (User specified register don't work correctly in inline-asm operands.)

gcc/ChangeLog:
2015-04-22  Hale Wang  <hale.wang@arm.com>
            Terry Guo  <terry.guo@arm.com>

       PR rtl-optimization/64818
       * combine.c (can_combine_p): Don't combine user-specified
       register if it is in an asm input.

gcc/testsuite/ChangeLog
2015-04-22  Hale Wang  <hale.wang@arm.com>
            Terry Guo  <terry.guo@arm.com>

       PR rtl-optimization/64818
       * gcc.target/arm/pr64818.c: New test.

Co-Authored-By: Terry Guo <terry.guo@arm.com>
From-SVN: r222306