Add REQUIRES line to machine-size-remarks

Just was made aware that this is necessary for tests outside of
the X86 subdirectory. Add a REQUIRES line to make sure bots that
don't enable x86 are happy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341885 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed