[arm64] Turn off the default NaN mode on arm64.

src/arm64/code-stubs-arm64.cc

 // 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1305 matching lines @@
   // Push callee-saved registers and synchronize the system stack pointer (csp)
   // and the JavaScript stack pointer (jssp).
   //
   // We must not write to jssp until after the PushCalleeSavedRegisters()
   // call, since jssp is itself a callee-saved register.
   __ SetStackPointer(csp);
   __ PushCalleeSavedRegisters();
   __ Mov(jssp, csp);
   __ SetStackPointer(jssp);
 
-  // Configure the FPCR. We don't restore it, so this is technically not allowed
-  // according to AAPCS64. However, we only set default-NaN mode and this will
-  // be harmless for most C code. Also, it works for ARM.
-  __ ConfigureFPCR();
-
   ProfileEntryHookStub::MaybeCallEntryHook(masm);
 
   // Set up the reserved register for 0.0.
   __ Fmov(fp_zero, 0.0);
 
   // Build an entry frame (see layout below).
   int marker = type();
   int64_t bad_frame_pointer = -1L;  // Bad frame pointer to fail if it is used.
   __ Mov(x13, bad_frame_pointer);
   __ Mov(x12, Smi::FromInt(marker));
@@ skipping 4736 matching lines @@
   __ Dmb(InnerShareable, BarrierAll);
   ReturnUnsignedInteger32(masm, d0, x0, x1, x2);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64