Minor decoder optimizations, kernel fixes, cpu backend fixes

src/xenia/cpu/xex_module.h

@@ -34,7 +34,8 @@ struct InfoCacheFlags {
   uint32_t was_resolved : 1;  // has this address ever been called/requested
                               // via resolvefunction?
   uint32_t accessed_mmio : 1;
-  uint32_t reserved : 30;
+  uint32_t is_syscall_func : 1;
+  uint32_t reserved : 29;
 };
 struct XexInfoCache {
   struct InfoCacheFlagsHeader {
@@ -208,12 +209,15 @@ class XexModule : public xe::cpu::Module {
   }
 
   InfoCacheFlags* GetInstructionAddressFlags(uint32_t guest_addr);
-  void PrecompileKnownFunctions();
 
+  virtual void Precompile() override; 
  protected:
   std::unique_ptr<Function> CreateFunction(uint32_t address) override;
 
  private:
+  void PrecompileKnownFunctions();
+  void PrecompileDiscoveredFunctions();
+  std::vector<uint32_t> PreanalyzeCode();
   friend struct XexInfoCache;
   void ReadSecurityInfo();