Add a VP_MAX_OPCODE entry to allow engines with internal opcodes to

place them sensibly.

src/mesa/shader/nvvertprog.h

@@ -66,7 +66,9 @@ enum vp_opcode
    VP_OPCODE_SLT,
    VP_OPCODE_SUB,
    VP_OPCODE_SWZ,		/* ARB only */
-   VP_OPCODE_XPD		/* ARB only */
+   VP_OPCODE_XPD,		/* ARB only */
+
+   VP_MAX_OPCODE
 };