Change properties to methods in light class hierarchy

There's a Kotlin-Java-Kotlin hierarchy with an abstract property in a
superclass and its implementation (as a get-method) in the Java subclass, which
caused problems because Kotlin subclass can't have both (different symbols,
same JVM signatures)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/JavaResolveExtension.kt

@@ -48,7 +48,7 @@ public object JavaResolveExtension : CacheExtension<(PsiElement) -> Pair<JavaDes
 }
 
 fun PsiMethod.getJavaMethodDescriptor(): FunctionDescriptor {
-    if (this is KotlinLightMethod) throw AssertionError("Light methods are not allowed here: ${origin?.getText()}")
+    if (this is KotlinLightMethod) throw AssertionError("Light methods are not allowed here: ${getOrigin()?.getText()}")
 
     val resolver = JavaResolveExtension.getResolver(getProject(), this)
     val methodDescriptor = when {

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KotlinLightClassForDecompiledDeclaration.kt

@@ -24,7 +24,7 @@ import org.jetbrains.kotlin.name.FqName
 
 class KotlinLightClassForDecompiledDeclaration(
         private val clsClass: ClsClassImpl,
-        override val origin: JetClassOrObject?
+        private val origin: JetClassOrObject?
 ) : KotlinWrappingLightClass(clsClass.getManager()) {
     override fun copy() = this
 
@@ -38,5 +38,7 @@ class KotlinLightClassForDecompiledDeclaration(
 
     override fun getDelegate() = clsClass
 
-    override val fqName: FqName = origin?.getFqName() ?: FqName(clsClass.getQualifiedName())
+    override fun getOrigin() = origin
+
+    override fun getFqName() = origin?.getFqName() ?: FqName(clsClass.getQualifiedName())
 }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/getModuleInfo.kt

@@ -111,7 +111,7 @@ private fun KotlinLightElement<*, *>.getModuleInfoForLightElement(): IdeaModuleI
     if (this is KotlinLightClassForDecompiledDeclaration) {
         return getModuleInfoByVirtualFile(getProject(), getContainingFile().getVirtualFile(), false)
     }
-    val element = origin ?: when (this) {
+    val element = getOrigin() ?: when (this) {
         is FakeLightClassForFileOfPackage -> this.getContainingFile()!!
         is KotlinLightClassForPackage -> this.getFiles().first()
         else -> throw IllegalStateException("Unknown light class without origin is referenced by IDE lazy resolve: $javaClass")

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/usagesSearch/utils.kt

@@ -140,7 +140,7 @@ fun PsiReference.isPropertyReadOnlyUsage(): Boolean {
 
     val refTarget = resolve()
     if (refTarget is KotlinLightMethod) {
-        val origin = refTarget.origin
+        val origin = refTarget.getOrigin()
         val declaration: JetNamedDeclaration? = when (origin) {
             is JetPropertyAccessor -> origin.getNonStrictParentOfType<JetProperty>()
             is JetProperty, is JetParameter -> origin as JetNamedDeclaration