mips.c (mips_expand_builtin_insn): Force the operands which correspond to the same input-output register to have...

	* config/mips/mips.c (mips_expand_builtin_insn): Force the
	operands which correspond to the same input-output register to
	have the same pseudo assigned to them.

	* gcc.target/mips/msa-dpadd-dpsub.c: New test.

From-SVN: r277071