mips.c (mips16e_save_restore_pattern_p): Check that the topmost argument register is not also included in the save mask.

gcc/
	* config/mips/mips.c (mips16e_save_restore_pattern_p): Check that
	the topmost argument register is not also included in the save mask.
	(mips16e_collect_argument_save_p): Take a pointer to the argument
	register, rather than a pointer to the number of arguments.
	(mips16e_collect_argument_saves): Only include argument saves
	that aren't in the register mask.

gcc/testsuite/
	* gcc.target/mips/save-restore-5.c: New test.

From-SVN: r126404