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.

src/xenia/cpu/sdb/xex_symbol_database.cc

@@ -51,8 +51,9 @@ public:
 
 
 XexSymbolDatabase::XexSymbolDatabase(
-    xe_memory_ref memory, ExportResolver* export_resolver, xe_xex2_ref xex) :
-    SymbolDatabase(memory, export_resolver) {
+    xe_memory_ref memory, ExportResolver* export_resolver,
+    SymbolTable* sym_table, xe_xex2_ref xex) :
+    SymbolDatabase(memory, export_resolver, sym_table) {
   xex_ = xe_xex2_retain(xex);
 }