Implement Math.tan in generated code.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index f8e5deaf719c93b73d895f2d533bc417e9d81438..c2bca84bc7c75ba0b93624c3dbf7dc27c8513c38 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -3015,6 +3015,18 @@ void FullCodeGenerator::EmitMathCos(CallRuntime* expr) {
 }
 
 
+void FullCodeGenerator::EmitMathTan(CallRuntime* expr) {
+  // Load the argument on the stack and call the stub.
+  TranscendentalCacheStub stub(TranscendentalCache::TAN,
+                               TranscendentalCacheStub::TAGGED);
+  ZoneList<Expression*>* args = expr->arguments();
+  ASSERT(args->length() == 1);
+  VisitForStackValue(args->at(0));
+  __ CallStub(&stub);
+  context()->Plug(rax);
+}
+
+
 void FullCodeGenerator::EmitMathLog(CallRuntime* expr) {
   // Load the argument on the stack and call the stub.
   TranscendentalCacheStub stub(TranscendentalCache::LOG,