mem: Use getGuestByteOrder in the indirect memory prefetcher.

Use that instead of accessing TheISA::GuestByteOrder directly.

Change-Id: I6fbeb7501aceadb95739bb482215097af18da2fa
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32926
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/cache/prefetch/indirect_memory.cc

@@ -46,15 +46,8 @@ IndirectMemory::IndirectMemory(const IndirectMemoryPrefetcherParams *p)
     ipd(p->ipd_table_assoc, p->ipd_table_entries, p->ipd_table_indexing_policy,
         p->ipd_table_replacement_policy,
         IndirectPatternDetectorEntry(p->addr_array_len, shiftValues.size())),
-    ipdEntryTrackingMisses(nullptr),
-#if THE_ISA != NULL_ISA
-    byteOrder(TheISA::GuestByteOrder)
-#else
-    byteOrder((ByteOrder) -1)
-#endif
+    ipdEntryTrackingMisses(nullptr), byteOrder(p->sys->getGuestByteOrder())
 {
-    fatal_if(byteOrder == static_cast<ByteOrder>(-1),
-            "This prefetcher requires a defined ISA\n");
 }
 
 void