re PR rtl-optimization/88179 ([MIPS]  pr84941.c ICE in lra_eliminate_reg_if_possible at lra-eliminations.c:1393  start with r266385)

2018-11-30  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/88179
	* lra-constraints.c (address_eliminator::address_eliminator):
	Don't eleminate regs in illegitimate address.

From-SVN: r266682