Implement a stub nnpc for alpha that is read only as npc+4.

--HG--
extra : convert_revision : d08b740d32757fa5471c9bcde9084d59a1d8102d

src/cpu/o3/alpha/thread_context.hh

@@ -45,8 +45,7 @@ class AlphaTC : public O3ThreadContext<Impl>
 
     virtual uint64_t readNextNPC()
     {
-        panic("Alpha has no NextNPC!");
-        return 0;
+        return this->readNextPC() + sizeof(TheISA::MachInst);
     }
 
     virtual void setNextNPC(uint64_t val)

src/cpu/o3/cpu.cc

@@ -659,9 +659,7 @@ FullO3CPU<Impl>::insertThread(unsigned tid)
     //Set PC/NPC/NNPC
     setPC(src_tc->readPC(), tid);
     setNextPC(src_tc->readNextPC(), tid);
-#if ISA_HAS_DELAY_SLOT
     setNextNPC(src_tc->readNextNPC(), tid);
-#endif
 
     src_tc->setStatus(ThreadContext::Active);