Minor decoder optimizations, kernel fixes, cpu backend fixes

src/xenia/cpu/ppc/ppc_frontend.cc

@@ -105,6 +105,11 @@ bool PPCFrontend::Initialize() {
 }
 
 bool PPCFrontend::DeclareFunction(GuestFunction* function) {
+
+	//chrispy: make sure we aren't declaring a function that is actually padding data, this will mess up PPCScanner and is hard to debug
+	//wow, this halo reach actually has branches into 0 opcodes, look into further
+  //xenia_assert(*reinterpret_cast<const uint32_t*>(
+  //                 this->memory()->TranslateVirtual(function->address())) != 0);
   // Could scan or something here.
   // Could also check to see if it's a well-known function type and classify
   // for later.