Resolve lateinit variables

Do not report UNINITIALIZED_VARIABLE on lateinit variables
Provide delegating constructors for descriptors for compatibility.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrDelegateDescriptor.kt

@@ -136,6 +136,7 @@ class IrLocalDelegatedPropertyDelegateDescriptorImpl(
 
     override fun getCompileTimeInitializer(): ConstantValue<*>? = null
     override fun isVar(): Boolean = false
+    override fun isLateInit(): Boolean = false
     override fun substitute(substitutor: TypeSubstitutor): VariableDescriptor? = throw UnsupportedOperationException()
     override fun getVisibility(): Visibility = Visibilities.LOCAL
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrTemporaryVariableDescriptor.kt

@@ -44,6 +44,8 @@ class IrTemporaryVariableDescriptorImpl(
 
     override fun isVar(): Boolean = isMutable
 
+    override fun isLateInit(): Boolean = false
+
     override fun <R, D> accept(visitor: DeclarationDescriptorVisitor<R, D>, data: D): R =
             visitor.visitVariableDescriptor(this, data)
 }