reassoc-32.c, [...]: Extend -mbranch-cost handling to MIPS.

reassoc-32.c, [...]: Extend -mbranch-cost handling to MIPS.

gcc/testsuite/
	* gcc.dg/tree-ssa/reassoc-32.c, gcc.dg/tree-ssa/reassoc-33.c,
	gcc.dg/tree-ssa/reassoc-34.c, gcc.dg/tree-ssa/reassoc-35.c,
	gcc.dg/tree-ssa/reassoc-36.c: Extend -mbranch-cost handling to MIPS.
	* gcc.dg/tree-ssa/ssa-ifcombine-ccmp-1.c,
	gcc.dg/tree-ssa/ssa-ifcombine-ccmp-4.c,
	gcc.dg/tree-ssa/ssa-ifcombine-ccmp-5.c,
	gcc.dg/tree-ssa/ssa-ifcombine-ccmp-6.c,
	gcc.dg/tree-ssa/vrp87.c, gcc.dg/tree-ssa/forwprop-28.c: Skip for MIPS.

From-SVN: r206446