GP-0_emteere minor change to make SP unaffected on V850

Author: emteere

Ghidra/Processors/V850/data/languages/V850.cspec

@@ -56,6 +56,10 @@
         <register name="r29"/>
         <register name="ep"/>
         <register name="lp"/>
+        <register name="sp"/>
+        <register name="gp"/>
+        <register name="tp"/>
+        <register name="ctbp"/>
       </unaffected>
 
     </prototype>