A64: Store/restore flags in deopt-every-n-times check

src/a64/lithium-codegen-a64.cc

Index: src/a64/lithium-codegen-a64.cc
diff --git a/src/a64/lithium-codegen-a64.cc b/src/a64/lithium-codegen-a64.cc
index ee5c0ecec3fa53d4f16c7499799515245d390420..64da578e5ccf5667e7f44cf9063dd64781341319 100644
--- a/src/a64/lithium-codegen-a64.cc
+++ b/src/a64/lithium-codegen-a64.cc
@@ -981,21 +981,23 @@ Deoptimizer::BailoutType LCodeGen::DeoptimizeHeader(
     Label not_zero;
     ExternalReference count = ExternalReference::stress_deopt_count(isolate());
 
-    __ Push(x0, x1);
+    __ Push(x0, x1, x2);
+    __ Mrs(x2, NZCV);
     __ Mov(x0, Operand(count));
     __ Ldr(w1, MemOperand(x0));
     __ Subs(x1, x1, 1);
     __ B(gt, &not_zero);
     __ Mov(w1, FLAG_deopt_every_n_times);
     __ Str(w1, MemOperand(x0));
-    __ Pop(x0, x1);
+    __ Pop(x0, x1, x2);
     ASSERT(frame_is_built_);
     __ Call(entry, RelocInfo::RUNTIME_ENTRY);
     __ Unreachable();
 
     __ Bind(&not_zero);
     __ Str(w1, MemOperand(x0));
-    __ Pop(x0, x1);
+    __ Msr(NZCV, x2);
+    __ Pop(x0, x1, x2);
   }
 
   return bailout_type;