ARM64: Use default-NaN mode to canonicalize NaNs.

src/arm64/macro-assembler-arm64-inl.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_
 
 #include <ctype.h>
 
 #include "v8globals.h"
@@ skipping 959 matching lines @@
 
 void MacroAssembler::Mrs(const Register& rt, SystemRegister sysreg) {
   ASSERT(allow_macro_instructions_);
   ASSERT(!rt.IsZero());
   mrs(rt, sysreg);
 }
 
 
 void MacroAssembler::Msr(SystemRegister sysreg, const Register& rt) {
   ASSERT(allow_macro_instructions_);
-  ASSERT(!rt.IsZero());
   msr(sysreg, rt);
 }
 
 
 void MacroAssembler::Msub(const Register& rd,
                           const Register& rn,
                           const Register& rm,
                           const Register& ra) {
   ASSERT(allow_macro_instructions_);
   ASSERT(!rd.IsZero());
@@ skipping 671 matching lines @@
   // characters are reserved for controlling features of the instrumentation.
   ASSERT(isprint(marker_name[0]) && isprint(marker_name[1]));
 
   InstructionAccurateScope scope(this, 1);
   movn(xzr, (marker_name[1] << 8) | marker_name[0]);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_