[X86] Remove non-existant instruction name from X86DisassemblerTables.cpp.

This instruction was removed a long time so we don't need to check for it here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330363 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed