Switch off FIR version off REDUNDANT_LABEL_WARNING (performance-related)

This reverts commit 363b2550 (partially)

compiler/testData/diagnostics/testsWithStdLib/contracts/controlflow/flowInlining/labeledReturns.fir.kt

@@ -83,4 +83,4 @@ fun threeLevelsReturnWithUnknown(x: Int?): Int? {
         }
     }
     return <!UNINITIALIZED_VARIABLE!>y<!>.inc()
-}
+}

compiler/testData/diagnostics/testsWithStdLib/coroutines/suspensionPointInMonitorNewInf.kt

@@ -59,4 +59,4 @@ suspend fun ifWhenAndOtherNonsence() {
     }
 }
 
-suspend fun returnsInt(): Int = 0
+suspend fun returnsInt(): Int = 0