Increase precision when finding the remainder after division by pi/2.

src/runtime.h

 // Copyright 2012 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 123 matching lines @@
   \
   F(NumberToString, 1, 1) \
   F(NumberToStringSkipCache, 1, 1) \
   F(NumberToInteger, 1, 1) \
   F(NumberToPositiveInteger, 1, 1) \
   F(NumberToIntegerMapMinusZero, 1, 1) \
   F(NumberToJSUint32, 1, 1) \
   F(NumberToJSInt32, 1, 1) \
   F(NumberToSmi, 1, 1) \
   F(AllocateHeapNumber, 0, 1) \
+  F(HeapNumberFromHex, 1, 1) \
   \
   /* Arithmetic operations */ \
   F(NumberAdd, 2, 1) \
   F(NumberSub, 2, 1) \
   F(NumberMul, 2, 1) \
   F(NumberDiv, 2, 1) \
   F(NumberMod, 2, 1) \
   F(NumberUnaryMinus, 1, 1) \
   F(NumberAlloc, 0, 1) \
   F(NumberImul, 2, 1) \
@@ skipping 693 matching lines @@
 class AllocateDoubleAlignFlag:    public BitField<bool,            0, 1> {};
 class AllocateTargetSpace:        public BitField<AllocationSpace, 1, 3> {};
 
 class DeclareGlobalsEvalFlag:     public BitField<bool,         0, 1> {};
 class DeclareGlobalsNativeFlag:   public BitField<bool,         1, 1> {};
 class DeclareGlobalsLanguageMode: public BitField<LanguageMode, 2, 2> {};
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_