[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/runtime/runtime.h

 // Copyright 2012 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_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/base/platform/time.h"
 #include "src/objects.h"
@@ skipping 336 matching lines @@
   F(LiveEditCheckAndDropActivations, 3, 1)          \
   F(LiveEditCompareStrings, 2, 1)                   \
   F(LiveEditRestartFrame, 2, 1)
 
 
 #define FOR_EACH_INTRINSIC_MATHS(F) \
   F(DoubleHi, 1, 1)                 \
   F(DoubleLo, 1, 1)                 \
   F(ConstructDouble, 2, 1)          \
   F(RemPiO2, 2, 1)                  \
-  F(MathAtan2, 2, 1)                \
   F(MathExpRT, 1, 1)                \
   F(MathPow, 2, 1)                  \
   F(MathPowRT, 2, 1)                \
   F(GenerateRandomNumbers, 1, 1)
 
 
 #define FOR_EACH_INTRINSIC_NUMBERS(F)  \
   F(NumberToRadixString, 2, 1)         \
   F(NumberToFixed, 2, 1)               \
   F(NumberToExponential, 2, 1)         \
@@ skipping 774 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_