SaveStates/SPU-LLVM: Fix SPU Access Violations on load

[elad335]

Fixes SPU LLVM access violations when loading savestates!! (the bug was in the saving process, so older savestates will still fail to load)

Fixes #16775

Savestates stability:

                                                     =+*+         
                                                 =+******=        
                                                 +=  +*+**:       
                                                    +*+  +*:      
                                                   =**:   :       
                                                   **-            
                                                  **+             
                                               :-+=               
                                              +**:                
                                            -**+                  
                                           +**=                   
                                          +**:                    
                                        -**+                      
                                       +**=                       
                                  :    :+=                        
                                 ++*+: +++                        
                                =**++***+                         
                               =**:   ++                          
                              =**-                                
                        :++  =**:                                 
                       -****+**-                                  
           ++         =**-:+**:                                   
         -****+      +**-   :-                                    
        =**- =***-  +*+                                           
       +**:    =+*****                                            
     :+*+        -+*+                                             
    -**+                                                          
   +**-                                                           
  +**:                                                            
 **+                                                              
  =