add mips target requirement to testcase

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179236 91177308-0d34-0410-b5e6-96231b3b80d8
get rid of stdio.h include in testcase

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179237 91177308-0d34-0410-b5e6-96231b3b80d8