re PR bootstrap/54128 (GCC does not bootstrap on little endian mips due to mis-compare on tree-data-ref.c)

2012-12-21  Steve Ellcey  <sellcey@mips.com>

	PR bootstrap/54128
	* ira.c (build_insn_chain): Check only NONDEBUG instructions for
	register usage.

From-SVN: r194676