[MIPS] Add thread-pointer to data addressing register list.

src/trusted/validator_mips/ncval.cc

Index: src/trusted/validator_mips/ncval.cc
diff --git a/src/trusted/validator_mips/ncval.cc b/src/trusted/validator_mips/ncval.cc
index d46c2c621619d931f57ed40cea855a785ccbd547..3ee0b4fd13a120e237d09a04af26d4c0ac5a1973 100644
--- a/src/trusted/validator_mips/ncval.cc
+++ b/src/trusted/validator_mips/ncval.cc
@@ -60,7 +60,7 @@ int Validate(const ncfile *ncf, bool use_zero_masks) {
       kQuarterGig,                       // Code region size.
       kOneGig,                           // Data region size.
       nacl_mips_dec::kRegListReserved,   // Read only registers.
-      RegisterList(kRegisterStack));     // Data addressing register ($sp).
+      nacl_mips_dec::kRegListDataAddr);  // Data addressing register ($sp).
 
   if (use_zero_masks) {
     validator.ChangeMasks(0, 0);