combine.c (make_compound_operation): If force_to_mode re-expanded the compound use gen_lowpart instead to convert to...

	* combine.c (make_compound_operation) <SUBREG>: If force_to_mode
	re-expanded the compound use gen_lowpart instead to convert to the
	desired mode.

testsuite/
	* gcc.target/mips/ext-2.c: New test.

From-SVN: r149781