re PR rtl-optimization/53916 ([mips16] divide operation compiled result incorrect with GCC-4.6.3 '-O2' option)

gcc/
	PR target/53916
	* config/mips/constraints.md (kl): New constraint.
	* config/mips/mips.md (divmod<mode>4, udivmod<mode>4): Delete.
	(divmod<mode>4_internal): Rename to divmod<mode>4.  Use "kl" as the
	constraint for operand 0.  Split after CSE for MIPS16.  Emit a move
	from LO for MIPS16.
	(udivmod<mode>4_internal): Likewise udivmod<mode>4.

gcc/testsuite/
	PR target/53916
	* gcc.target/mips/div-13.c: New test.

From-SVN: r199329