re PR tree-optimization/89386 (Generation of vectorized MULHRS (Multiply High with Round and Scale) instruction)

	PR tree-optimization/89386
	* config/i386/sse.md (smulhrs<mode>3): New expander.
	(smulhrsv4hi3): Ditto.

testsuite/ChangeLog:

	PR tree-optimization/89386
	* gcc.target/i386/pr89386.c: New test.
	* gcc.target/i386/pr89386-1.c: Ditto.

From-SVN: r275689