JVM IR: Avoid direct lambda invokes in inline tests

compiler/testData/codegen/boxInline/defaultValues/lambdaInlining/thisClash.kt

@@ -6,8 +6,8 @@ inline fun String.inlineFun(crossinline lambda: () -> String = { { this }() }):
     return {
         {
             this + lambda()
-        }()
-    }()
+        }.let { it() }
+    }.let { it() }
 }
 
 // FILE: 2.kt