Explicit equals method for primitives and correct global equals method.

Includes cosmetics.
#KT-2372 Fixed

js/js.translator/testFiles/expression/equals/cases/explicitEqualsMethod.kt

@@ -9,8 +9,8 @@ class Foo(val name: String) {
     }
 }
 
-fun callEqualsMethod(v1: Foo, v2: Foo): Boolean {
-  return v1.equals(v2)
+class Bar() {
+
 }
 
 fun box() : Boolean {
@@ -18,7 +18,11 @@ fun box() : Boolean {
     val b = Foo("abc")
     val c = Foo("def")
 
-    if (!callEqualsMethod(a, b)) return false
-    if (callEqualsMethod(a, c)) return false
+    if (!(a equals b)) return false
+    if (a equals c) return false
+    if (Bar() equals Bar()) return false
+    val g = Bar()
+    if (!(g equals g)) return false
+    if (g equals Bar()) return false
     return true
 }

js/js.translator/testFiles/expression/equals/cases/explicitEqualsMethodForPrimitives.kt

@@ -0,0 +1,21 @@
+package foo
+
+fun box() : Boolean {
+  val a = 2
+  if (!(a equals a)) return false
+  if (!(a equals 2)) return false
+  if (!(a equals 2.0)) return false
+  val c = "a"
+  if (!("a" equals c)) return false
+  if (!(null equals null)) return false
+  val d = 5.6
+  if (!(d.toShort() equals 5.toShort())) return false
+  if (!(d.toByte() equals 5.toByte())) return false
+  if (!(d.toFloat() equals 5.6.toFloat())) return false
+  if (!(d.toInt() equals 5)) return false
+  if (true equals false) return false
+
+  val n: Number = 3
+  if (!(n equals 3.3.toInt())) return false
+  return true
+}