Support reading binary metadata of the next major release

Already existing tests testRequireKotlinInNestedClassesAgainst14{,Js}
now check that there's no error when loading a module/class with
metadata version 1.4.0

 #KT-25972 Fixed

core/metadata/src/org/jetbrains/kotlin/metadata/builtins/BuiltInsBinaryVersion.kt

@@ -14,7 +14,8 @@ import java.io.InputStream
  * of the core protobuf messages (metadata.proto).
  */
 class BuiltInsBinaryVersion(vararg numbers: Int) : BinaryVersion(*numbers) {
-    override fun isCompatible() = this.isCompatibleTo(INSTANCE)
+    override fun isCompatible() =
+        isMetadataVersionCompatible()
 
     companion object {
         @JvmField

core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/BinaryVersion.kt

@@ -35,6 +35,12 @@ abstract class BinaryVersion(private vararg val numbers: Int) {
         else major == ourVersion.major && minor <= ourVersion.minor
     }
 
+    // In Kotlin 1.4, all metadata versions (JVM, JS, built-ins/metadata) are going to be advanced to 1.4.0.
+    // Kotlin 1.3 is able to read metadata of versions up to Kotlin 1.4
+    protected fun isMetadataVersionCompatible(): Boolean {
+        return major == 1 && minor <= 4
+    }
+
     fun isAtLeast(major: Int, minor: Int, patch: Int): Boolean {
         if (this.major > major) return true
         if (this.major < major) return false