Implement Math.tan in generated code.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1257 matching lines @@
   void fucomi(int i);
   void fucomip();
 
   void fcompp();
   void fnstsw_ax();
   void fwait();
   void fnclex();
 
   void fsin();
   void fcos();
+  void fptan();
   void fyl2x();
 
   void frndint();
 
   void sahf();
 
   // SSE2 instructions
   void movd(XMMRegister dst, Register src);
   void movd(Register dst, XMMRegister src);
   void movq(XMMRegister dst, Register src);
@@ skipping 352 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_