Fix build issue on NetBSD: Correct namespace of OptLevel::DEBUG_CODE
Fix build issue on NetBSD: Correct namespace of OptLevel::DEBUG_CODE

This patch addresses the following error on NetBSD-7.99.26 with GCC-4.8.5:
/tmp/pkgsrc-tmp/wip/llilc-git/work/llvm/tools/llilc/lib/Jit/jitoptions.cpp:
In constructor 'JitOptions::JitOptions(LLILCJitContext&)':
/tmp/pkgsrc-tmp/wip/llilc-git/work/llvm/tools/llilc/lib/Jit/jitoptions.cpp:66:36:
error: 'OptLevel' is not a class, namespace, or enumeration
   EnableOptimization = OptLevel != OptLevel::DEBUG_CODE;
                                    ^

swaroop-sridhar/llilc,adiaaida/llilc,dotnet/llilc,swaroop-sridhar/llilc,kyulee1/llilcjit,kyulee1/llilcjit,swaroop-sridhar/llilc,russellhadley/llilc,dotnet/llilc,adiaaida/llilc,russellhadley/llilc,kyulee1/llilcjit,dotnet/llilc,adiaaida/llilc,russellhadley/llilc