FIR2IR: fix origins for anonymous functions & lambdas

compiler/testData/ir/irText/lambdas/anonymousFunction.fir.ir.txt

@@ -1,13 +0,0 @@
-FILE fqName:<root> fileName:/anonymousFunction.kt
-  PROPERTY name:anonymous visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:anonymous type:kotlin.Function0<kotlin.Unit> visibility:private [final,static]
-      EXPRESSION_BODY
-        FUN_EXPR type=kotlin.Function0<kotlin.Unit> origin=LAMBDA
-          FUN LOCAL_FUNCTION_FOR_LAMBDA name:<no name provided> visibility:local modality:FINAL <> () returnType:kotlin.Unit
-            BLOCK_BODY
-              CALL 'public final fun println (): kotlin.Unit [inline] declared in kotlin.io.ConsoleKt' type=kotlin.Unit origin=null
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-anonymous> visibility:public modality:FINAL <> () returnType:kotlin.Function0<kotlin.Unit>
-      correspondingProperty: PROPERTY name:anonymous visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-anonymous> (): kotlin.Function0<kotlin.Unit> declared in <root>'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:anonymous type:kotlin.Function0<kotlin.Unit> visibility:private [final,static]' type=kotlin.Function0<kotlin.Unit> origin=null

compiler/testData/ir/irText/lambdas/anonymousFunction.fir.kt.txt

@@ -1,6 +0,0 @@
-val anonymous: Function0<Unit>
-  field = local fun <no name provided>() {
-    println()
-  }
-
-  get

compiler/testData/ir/irText/lambdas/anonymousFunction.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 
 val anonymous = fun() { println() }