Initial libjit skeleton.

Not currently generating instructions, but most of the flow is right up to
that point. A lot of work required to refactor the emitter, but wanted to
get this checked in.

tools/xenia-run/xenia-run.cc

@@ -46,7 +46,7 @@ int Run::Setup() {
   xe_zero_struct(&pal_options, sizeof(pal_options));
   XEEXPECTZERO(xe_pal_init(pal_options));
 
-  //backend_ = shared_ptr<Backend>(new xe::cpu::llvmbe::LLVMBackend());
+  backend_ = shared_ptr<Backend>(new xe::cpu::libjit::LibjitBackend());
 
   debugger_ = shared_ptr<Debugger>(new Debugger());
 
@@ -116,8 +116,6 @@ int xenia_run(int argc, xechar_t **argv) {
   result_code = run->Setup();
   XEEXPECTZERO(result_code);
 
-  //xe_module_dump(run->module);
-
   run->Launch(path);
 
   result_code = 0;

tools/xenia-test/xenia-test.cc

@@ -120,7 +120,7 @@ int run_test(string& src_file_path) {
   memory = xe_memory_create(memory_options);
   XEEXPECTNOTNULL(memory);
 
-  //backend = shared_ptr<Backend>(new xe::cpu::llvmbe::LLVMBackend());
+  backend_ = shared_ptr<Backend>(new xe::cpu::libjit::LibjitBackend());
 
   processor = shared_ptr<Processor>(new Processor(memory, backend));
   XEEXPECTZERO(processor->Setup());