X86: Remove redundant test instructions

Increase the number of instructions LLVM recognizes as setting the ZF
flag. This allows us to remove test instructions that redundantly
recalculate the flag.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181937 91177308-0d34-0410-b5e6-96231b3b80d8