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

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 07a7305a34024ace326c3b28074839eece6afe52..3047cd41c185b9de0b8f64b90f7260f6689ee59d 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -1072,8 +1072,6 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   }
   // Result returned in r0, r1:r0 or r2:r1:r0 - do not destroy these registers!
 
-  __ VFPEnsureFPSCRState(r3);
-
   // Check result for exception sentinel.
   Label exception_returned;
   __ CompareRoot(r0, Heap::kExceptionRootIndex);
@@ -1183,7 +1181,6 @@ void JSEntryStub::Generate(MacroAssembler* masm) {
   __ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
   // Set up the reserved register for 0.0.
   __ vmov(kDoubleRegZero, 0.0);
-  __ VFPEnsureFPSCRState(r4);
 
   // Get address of argv, see stm above.
   // r0: code entry
@@ -3238,7 +3235,6 @@ void DirectCEntryStub::Generate(MacroAssembler* masm) {
   // GC safe. The RegExp backend also relies on this.
   __ str(lr, MemOperand(sp, 0));
   __ blx(ip);  // Call the C++ function.
-  __ VFPEnsureFPSCRState(r2);
   __ ldr(pc, MemOperand(sp, 0));
 }