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

[Jack Carter]

  Ok, to reiterate, With the exception of the added tests and basic_operations.ll, all these tests should have the same output irregardless of the endianess. The XFAIL tests should also have the same output, but currently don't and thus fail.

  If that is the case this LGTM.

  A minor nit is that you may want to change '_' to '-' in your test case names. I tend to use the underscore since I am old school, but have been encouraged to change over to dash.

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