[Mips] Remove duplicate lines from MipsScheduleP5600.td and enable FullInstRWOverlapCheck.

This fixes the errors found by the new check added in r327808.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327813 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed