[mips] Small fixes to test/CodeGen/mips-clobber-reg.c

Fixed the following:
- Whitespace at end of most lines
- $11 test actually testing $10



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194473 91177308-0d34-0410-b5e6-96231b3b80d8