[mips] Split large test file into 3 smaller ones.

Remove the old select.ll file and use select-int.ll, select-flt.ll,
select-dbl.ll for testing selects on integers, floats & doubles respectivelly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259361 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed