Remove deprecated v8::base::OS::nan_value().

src/mips64/assembler-mips64.cc

Index: src/mips64/assembler-mips64.cc
diff --git a/src/mips64/assembler-mips64.cc b/src/mips64/assembler-mips64.cc
index b8f582131c143459c76bd74c53367345d3369fcb..ba784d3b442026d450ae7ded73fcfba018b6c7e3 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -2834,7 +2834,7 @@ Address Assembler::target_address_at(Address pc) {
 // snapshot generated on ia32, the resulting MIPS sNaN must be quieted.
 // OS::nan_value() returns a qNaN.
 void Assembler::QuietNaN(HeapObject* object) {
-  HeapNumber::cast(object)->set_value(base::OS::nan_value());
+  HeapNumber::cast(object)->set_value(std::numeric_limits<double>::quiet_NaN());
 }