2014-10-01  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/
	PR rtl-optimization/62151
	* combine.c (can_combine_p): Allow the destination register of INSN
	to be clobbered in I3.
	(subst): Do not substitute into clobbers of registers.

gcc/testsuite/
	* gcc.dg/combine-clobber.c: New.

From-SVN: r215789