X87: [builtins] Introduce proper Float64Tan operator.

src/crankshaft/x87/lithium-x87.h

Index: src/crankshaft/x87/lithium-x87.h
diff --git a/src/crankshaft/x87/lithium-x87.h b/src/crankshaft/x87/lithium-x87.h
index 1f7bc55105183a13ac936fe4ccae5434fbd4149d..d05d6ebc3c84143d5e10728b52b8953479675bcd 100644
--- a/src/crankshaft/x87/lithium-x87.h
+++ b/src/crankshaft/x87/lithium-x87.h
@@ -58,7 +58,6 @@ class LCodeGen;
   V(ConstantI)                               \
   V(ConstantS)                               \
   V(ConstantT)                               \
-  V(ConstructDouble)                         \
   V(Context)                                 \
   V(DebugBreak)                              \
   V(DeclareGlobals)                          \
@@ -2357,20 +2356,6 @@ class LDoubleBits final : public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LConstructDouble final : public LTemplateInstruction<1, 2, 0> {
- public:
-  LConstructDouble(LOperand* hi, LOperand* lo) {
-    inputs_[0] = hi;
-    inputs_[1] = lo;
-  }
-
-  LOperand* hi() { return inputs_[0]; }
-  LOperand* lo() { return inputs_[1]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(ConstructDouble, "construct-double")
-};
-
-
 class LAllocate final : public LTemplateInstruction<1, 2, 1> {
  public:
   LAllocate(LOperand* context, LOperand* size, LOperand* temp) {