Introduce Kotlin language version 1.2

Wherein DEFAULT version is still 1.1, which means that version 1.2 should be configured manually

compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -681,4 +681,4 @@ public class CompileKotlinAgainstCustomBinariesTest extends TestCaseWithTmpdir {
                 new File(getTestDataDirectory(), "output.txt"), normalizeOutput(outputMain)
         );
     }
-}
+}

compiler/tests/org/jetbrains/kotlin/util/KotlinVersionsTest.kt

@@ -85,7 +85,7 @@ class KotlinVersionsTest : KtUsefulTestCase() {
         )
 
         versions.add(
-                LanguageVersion.LATEST.versionString.toVersion("LanguageVersion.LATEST")
+                LanguageVersion.LATEST_STABLE.versionString.toVersion("LanguageVersion.LATEST_STABLE")
         )
 
         if (versions.any { v1 -> versions.any { v2 -> !v1.isConsistentWith(v2) } }) {