mips.h (REG_ALLOC_ORDER): Put accumulators first.

mips.h (REG_ALLOC_ORDER): Put accumulators first.

gcc/
	* config/mips/mips.h (REG_ALLOC_ORDER): Put accumulators first.
	Tweak formatting.
	* config/mips/mips.c (mips_ira_cover_classes): Don't use accumulator
	registers when not optimizing.

gcc/testsuite/
	* gcc.target/mips/dspr2-MULT.c: Just check for $ac1 and $ac2.
	* gcc.target/mips/dspr2-MULTU.c: Likewise.

From-SVN: r141955