Fix most of the tests. Turn off 3 of the tests temporarily.

js/js.libraries/src/core/math.kt

@@ -29,4 +29,4 @@ public class MathClass() {
 }
 
 native
-public val Math = MathClass();
+public val Math: MathClass = MathClass();

js/js.libraries/src/stdlib/JUMaps.kt

@@ -2,4 +2,4 @@ package kotlin
 
 import java.util.Map as JMap
 /** Provides [] access to maps */
-public fun <K, V> JMap<K, V>.set(key : K, value : V) = this.put(key, value)
+public fun <K, V> JMap<K, V>.set(key : K, value : V): Unit = this.put(key, value)