re PR target/70302 (crash on valid code at -O2 and -O3 in 32-bit mode on x86_64-linux-gnu (in convert_op, at config/i386/i386.c:3414))

2016-03-22  Ilya Enkovich  <enkovich.gnu@gmail.com>

	PR target/70302
	* config/i386/i386.c (scalar_chain::convert_op): Support
	uninitialized register usage case.

	PR target/70302
	* gcc.target/i386/pr70302.c: New test.

From-SVN: r234406