re PR middle-end/42220 (FAIL: gfortran.dg/complex_intrinsic_5.f90 -m64 -O -frename...

re PR middle-end/42220 (FAIL: gfortran.dg/complex_intrinsic_5.f90  -m64 -O -frename-registers)

	PR rtl-optimization/42220
	* regrename.c (scan_rtx) <case STRICT_LOW_PART, ZERO_EXTRACT>:
	Use verify_reg_tracked to determine if we should use OP_OUT rather
	than OP_INOUT.
	(build_def_use): If we see an in-out operand for a register that we
	know nothing about, treat is an output if possible, fail the block if
	not.

From-SVN: r157263