A64: Fix register update detection for csp.

src/a64/simulator-a64.cc

Index: src/a64/simulator-a64.cc
diff --git a/src/a64/simulator-a64.cc b/src/a64/simulator-a64.cc
index bc4eb78efca70140123264124a763b0d1495c049..5a0dcf819b2f5e41f3b909937aedd1e0514dc3a2 100644
--- a/src/a64/simulator-a64.cc
+++ b/src/a64/simulator-a64.cc
@@ -854,7 +854,7 @@ void Simulator::PrintRegisters(bool print_all_regs) {
               clr_normal);
     }
     // Cache the new register value so the next run can detect any changes.
-    last_regs[i] = xreg(i);
+    last_regs[i] = xreg(i, Reg31IsStackPointer);
   }
   first_run = false;
 }