[PATCH] [mips][msa] Build all the tests in little and big endian modes and correct an incorrect test.

[Jack Carter]

  I have no problem with delaying the test name changes. Maybe we can set a date down the road and change all the Mips tests to eliminate underscores in the name.

  A good project for me ;-)

http://llvm-reviews.chandlerc.com/D1972