Build: fix registration of ClassFileDecompilers extension

compiler/cli/cli-common/resources/META-INF/extensions/core.xml

@@ -0,0 +1,10 @@
+<idea-plugin>
+    <id>org.jetbrains.kotlin</id>
+    <version>1.2</version>
+
+    <extensionPoints>
+        <extensionPoint qualifiedName="com.intellij.psi.classFileDecompiler"
+                        interface="com.intellij.psi.compiled.ClassFileDecompilers$Decompiler"
+                        dynamic="true"/>
+    </extensionPoints>
+</idea-plugin>

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreApplicationEnvironment.java

@@ -40,7 +40,6 @@ public class KotlinCoreApplicationEnvironment extends JavaCoreApplicationEnviron
         registerApplicationExtensionPoint(JavaMainMethodProvider.EP_NAME, JavaMainMethodProvider.class);
 
         registerApplicationExtensionPoint(ContainerProvider.EP_NAME, ContainerProvider.class);
-        registerApplicationExtensionPoint(ClassFileDecompilers.EP_NAME, ClassFileDecompilers.Decompiler.class);
 
         registerApplicationExtensionPoint(MetaLanguage.EP_NAME, MetaLanguage.class);
 
@@ -52,4 +51,4 @@ public class KotlinCoreApplicationEnvironment extends JavaCoreApplicationEnviron
     protected VirtualFileSystem createJrtFileSystem() {
         return new CoreJrtFileSystem();
     }
-}
+}

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -509,6 +509,7 @@ class KotlinCoreEnvironment private constructor(
             val applicationEnvironment = KotlinCoreApplicationEnvironment.create(parentDisposable, unitTestMode)
 
             registerApplicationExtensionPointsAndExtensionsFrom(configuration, "extensions/compiler.xml")
+            registerApplicationExtensionPointsAndExtensionsFrom(configuration, "extensions/core.xml")
 
             registerApplicationServicesForCLI(applicationEnvironment)
             registerApplicationServices(applicationEnvironment)
@@ -692,4 +693,4 @@ class KotlinCoreEnvironment private constructor(
             }
         }
     }
-}
+}