FIR2IR: add extension receiver parameters to functions

compiler/testData/ir/irText/errors/suppressedNonPublicCall.fir.txt

@@ -21,7 +21,8 @@ FILE fqName:<root> fileName:/suppressedNonPublicCall.kt
       overridden:
         public open fun toString (): kotlin.String declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any 
-  FUN name:foo visibility:public modality:FINAL <> () returnType:kotlin.Unit [inline] 
+  FUN name:foo visibility:public modality:FINAL <> ($receiver:<root>.C) returnType:kotlin.Unit [inline]
+    $receiver: VALUE_PARAMETER name:<this> type:<root>.C
     BLOCK_BODY
       CALL 'internal final fun bar (): kotlin.Unit declared in <root>.C' type=kotlin.Unit origin=null