Add missing test for transcendental functions.

test/mjsunit/regress/regress-transcendental.js

+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
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+
+// Flags: --expose-gc
+
+// Test whether the runtime implementation and generated code of
+// sine and tangens return the same results.
+
+function test(f, x, name) {
+  // Reset transcendental cache.
+  gc();
+  // Initializing cache leads to a runtime call.
+  var runtime_result = f(x);
+  // Flush transcendental cache.
+  for (var i = 0; i < 100000; i++) f(i);
+  // Calculate using generated code.
+  var gencode_result = f(x);
+  print(name + " runtime function: " + runtime_result);
+  print(name + " generated code  : " + gencode_result);
+  assertEquals(gencode_result, runtime_result);
+}
+
+test(Math.tan, -1.57079632679489660000, "Math.tan");
+test(Math.sin, 6.283185307179586, "Math.sin");
+