re PR target/48605 (gcc.target/i386/sse4_1-insertps-2.c FAILs with -mtune=geode - instruction insertps with memory operands behaves differently)

	PR target/48605
	* config/i386/sse.md (sse4_1_insertps): If operands[2] is a MEM,
	offset it as needed based on top 2 bits in operands[3], change
	MEM mode to SFmode and mask those 2 bits away from operands[3].

	* gcc.target/i386/sse4_1-insertps-3.c: New test.
	* gcc.target/i386/sse4_1-insertps-4.c: New test.
	* gcc.target/i386/avx-insertps-3.c: New test.
	* gcc.target/i386/avx-insertps-4.c: New test.

From-SVN: r172458