On the files generated by sim/common/genmloop.sh, variables pbb_br_type and
pbb_br_npc are declared uninitialized and passed to other functions in some
cases.  Despite that those are harmless, they will generate GCC warnings
("-Wmaybe-uninitialized").
This commit ensures that pbb_br_type and pbb_br_npc variables are
initialized to a harmless value.
   SEM_PC vpc;
 #if WITH_SEM_SWITCH_FULL
   /* For communication between cti's and cti-chain.  */
-  SEM_BRANCH_TYPE pbb_br_type;
-  PCADDR pbb_br_npc;
+  SEM_BRANCH_TYPE pbb_br_type = SEM_BRANCH_UNTAKEN;
+  PCADDR pbb_br_npc = 0;
 #endif
 
 EOF
   SEM_PC vpc;
 #if WITH_SEM_SWITCH_FAST
   /* For communication between cti's and cti-chain.  */
-  SEM_BRANCH_TYPE pbb_br_type;
-  PCADDR pbb_br_npc;
+  SEM_BRANCH_TYPE pbb_br_type = SEM_BRANCH_UNTAKEN;
+  PCADDR pbb_br_npc = 0;
 #endif
 
 EOF