[FIR] Introduce extended checkers for inspection-like diagnostics

compiler/tests-common/tests/org/jetbrains/kotlin/fir/AbstractExtendedFirDiagnosticsTest.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir
+
+abstract class AbstractExtendedFirDiagnosticsTest : AbstractFirDiagnosticsTest() {
+    override fun useExtendedCheckersIfNeeded(): Boolean = true
+}

compiler/tests-common/tests/org/jetbrains/kotlin/fir/AbstractFirDiagnosticTest.kt

@@ -276,7 +276,7 @@ abstract class AbstractFirDiagnosticsTest : AbstractFirBaseDiagnosticsTest() {
     }
 
     private fun createCollector(session: FirSession): AbstractDiagnosticCollector {
-        return FirDiagnosticsCollector.create(session)
+        return FirDiagnosticsCollector.create(session, useExtendedCheckersIfNeeded())
     }
 
     private fun checkCfgDump(testDataFile: File, firFiles: List<FirFile>) {
@@ -359,4 +359,6 @@ abstract class AbstractFirDiagnosticsTest : AbstractFirBaseDiagnosticsTest() {
         }
 
     }
+
+    internal open fun useExtendedCheckersIfNeeded() = false
 }