Un-XFail TestYMMRegister on linux

This test was disabled in r326756 as a part of "upstreaming debugserver
support for AVX-512 (zmm register set)". This looks like an error
because both register set and remote stubs are different.

In any case, the test passes now.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@349485 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed