Address warnings in EmulateInstructionARM64

- Remove default for switch which covers all enumeration values

- Remove unused functions
  LSL_C is left in the source under #if 0, as it may be needed in the
  future for emulating other instructions.

Differential Revision: http://reviews.llvm.org/D3528


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@207449 91177308-0d34-0410-b5e6-96231b3b80d8
Added debugserver/llgs protocol test for output and clean exit.

Tests for $vCont;c program start, $O output and $W status code.
@llgs_test variant currently marked as expected fail.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@207492 91177308-0d34-0410-b5e6-96231b3b80d8
Merge r207492 into dev-tfiala-native-protocol-linux-x86_64