Make each test disable-able, and enable tests of instructions that are
currently supported.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13993 a5019735-40e9-0310-863c-91ae7b9d1cf9
mips64: Tests for Cavium MIPS Octeon Atomic and Count Instructions.

Tests for instructions:
baddu, pop, dpop, saa, saad, laa, laad, lai, laid, lad, ladd, law, lawd,
las, lasd, lac, lacd


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13994 a5019735-40e9-0310-863c-91ae7b9d1cf9