[jak2] GOAL side texture animation stuff (#2766)

It turns out we didn't decompile any of this stuff yet.

decompiler/IR2/OpenGoalMapping.cpp

@@ -51,6 +51,9 @@ const std::map<InstructionKind, OpenGOALAsm::Function> MIPS_ASM_TO_OPEN_GOAL_FUN
     {InstructionKind::PCPYLD, {".pcpyld", {}}},
     {InstructionKind::PCPYUD, {".pcpyud", {}}},
 
+    // MMI Add
+    {InstructionKind::PADDB, {".paddb", {}}},
+
     // NOTE - depending on how this is used, this may case issues! Be Warned!
     // lots of implicit logic in OpenGOAL depending on argument types!
     {InstructionKind::MFC1, {".mov", {}}},