Kapt: dump declaration origins produced by backend

This will be useful in diagnosing behavior differences between JVM and
JVM_IR versions of kapt.

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/JvmDeclarationOrigin.kt

@@ -23,6 +23,9 @@ class JvmDeclarationOrigin(
     val descriptor: DeclarationDescriptor?,
     val parametersForJvmOverload: List<KtParameter?>? = null
 ) {
+    override fun toString(): String =
+        if (this == NO_ORIGIN) "NO_ORIGIN" else "origin=$originKind element=${element?.javaClass?.simpleName} descriptor=$descriptor"
+
     companion object {
         @JvmField
         val NO_ORIGIN: JvmDeclarationOrigin = JvmDeclarationOrigin(OTHER, null, null)