[FIR] Get rid of implicit type refs with source

#KT-55835

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/BuilderConfigurator.kt

@@ -313,10 +313,6 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
             withCopy()
         }
 
-        builder(implicitTypeRef) {
-            withCopy()
-        }
-
         builder(breakExpression) {
             parents += loopJumpBuilder
         }
@@ -442,9 +438,7 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
 
         // -----------------------------------------------------------------------
 
-        findImplementationsWithElementInParents(annotationContainer) {
-            it.type !in setOf("FirImplicitTypeRefImpl")
-        }.forEach {
+        findImplementationsWithElementInParents(annotationContainer).forEach {
             it.builder?.parents?.add(annotationContainerBuilder)
         }
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -536,12 +536,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
         }
 
         impl(functionTypeRef)
-        impl(implicitTypeRef) {
-            defaultEmptyList("annotations")
-            default("source") {
-                notNull = true
-            }
-        }
+        noImpl(implicitTypeRef)
 
         impl(reference, "FirStubReference") {
             default("source") {