[builtins] Introduce proper Float64Tan operator.

src/compiler/arm64/code-generator-arm64.cc

 // Copyright 2014 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.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 825 matching lines @@
       break;
     case kIeee754Float64Log2:
       ASSEMBLE_IEEE754_UNOP(log2);
       break;
     case kIeee754Float64Log10:
       ASSEMBLE_IEEE754_UNOP(log10);
       break;
     case kIeee754Float64Sin:
       ASSEMBLE_IEEE754_UNOP(sin);
       break;
+    case kIeee754Float64Tan:
+      ASSEMBLE_IEEE754_UNOP(tan);
+      break;
     case kArm64Float32RoundDown:
       __ Frintm(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float64RoundDown:
       __ Frintm(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float32RoundUp:
       __ Frintp(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float64RoundUp:
@@ skipping 1123 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8