[builtins] Introduce proper Float64Cos and Float64Sin.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 86bf8fda74568004c12072f93973f12c55e28306..e8c7fbeb94b1019bfe6108338b119b6101fd4389 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1679,6 +1679,7 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     SimpleInstallFunction(math, "cbrt", Builtins::kMathCbrt, 1, true);
     SimpleInstallFunction(math, "expm1", Builtins::kMathExpm1, 1, true);
     SimpleInstallFunction(math, "clz32", Builtins::kMathClz32, 1, true);
+    SimpleInstallFunction(math, "cos", Builtins::kMathCos, 1, true);
     Handle<JSFunction> math_exp =
         SimpleInstallFunction(math, "exp", Builtins::kMathExp, 1, true);
     native_context()->set_math_exp(*math_exp);
@@ -1696,6 +1697,7 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     SimpleInstallFunction(math, "max", Builtins::kMathMax, 2, false);
     SimpleInstallFunction(math, "min", Builtins::kMathMin, 2, false);
     SimpleInstallFunction(math, "round", Builtins::kMathRound, 1, true);
+    SimpleInstallFunction(math, "sin", Builtins::kMathSin, 1, true);
     Handle<JSFunction> math_sqrt =
         SimpleInstallFunction(math, "sqrt", Builtins::kMathSqrt, 1, true);
     native_context()->set_math_sqrt(*math_sqrt);