ARM64: Use default-NaN mode to canonicalize NaNs.

test/cctest/test-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 159 matching lines @@
 #define SETUP_SIZE(buf_size)                                                   \
   Isolate* isolate = Isolate::Current();                                       \
   HandleScope scope(isolate);                                                  \
   ASSERT(isolate != NULL);                                                     \
   byte* buf = new byte[buf_size];                                              \
   MacroAssembler masm(isolate, buf, buf_size);                                 \
   RegisterDump core;                                                           \
   CpuFeatures::Probe(false);
 
 #define RESET()                                                                \
-  __ Reset();
+  __ Reset();                                                                  \
+  /* Reset the machine state (like simulator.ResetState()). */                 \
+  __ Msr(NZCV, xzr);                                                           \
+  __ Msr(FPCR, xzr);
+
 
 #define START_AFTER_RESET()                                                    \
   __ SetStackPointer(csp);                                                     \
   __ PushCalleeSavedRegisters();
 
 #define START()                                                                \
   RESET();                                                                     \
   START_AFTER_RESET();
 
 #define RUN()                                                                  \
@@ skipping 10763 matching lines @@
     if (RelocInfo::IsVeneerPool(info->rmode())) {
       ASSERT(info->data() == veneer_pool_size);
       ++pool_count;
     }
   }
 
   ASSERT(pool_count == 2);
 
   TEARDOWN();
 }