mesa: added some assertions in BNGLOOP/ENDLOOP cases
diff --git a/src/mesa/shader/prog_execute.c b/src/mesa/shader/prog_execute.c
index 038ce0b..025665a 100644
--- a/src/mesa/shader/prog_execute.c
+++ b/src/mesa/shader/prog_execute.c
@@ -684,9 +684,13 @@
          break;
       case OPCODE_BGNLOOP:
          /* no-op */
+         ASSERT(program->Instructions[inst->BranchTarget].Opcode
+                == OPCODE_ENDLOOP);
          break;
       case OPCODE_ENDLOOP:
          /* subtract 1 here since pc is incremented by for(pc) loop */
+         ASSERT(program->Instructions[inst->BranchTarget].Opcode
+                == OPCODE_BGNLOOP);
          pc = inst->BranchTarget - 1;   /* go to matching BNGLOOP */
          break;
       case OPCODE_BGNSUB:      /* begin subroutine */