[JS IR test] Add an ability to setup phases to dump after and phases to validate after in box tests using system properties

js/js.tests/test/org/jetbrains/kotlin/js/test/BasicIrBoxTest.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.js.test
 
+import org.jetbrains.kotlin.backend.common.phaser.AnyNamedPhase
 import org.jetbrains.kotlin.backend.common.phaser.PhaseConfig
 import org.jetbrains.kotlin.backend.common.phaser.toPhaseMap
 import org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport
@@ -118,8 +119,8 @@ abstract class BasicIrBoxTest(
                 PhaseConfig(
                     jsPhases,
                     dumpToDirectory = dumpOutputDir.path,
-                    toDumpStateAfter = allPhasesSet,
-                    toValidateStateAfter = allPhasesSet,
+                    toDumpStateAfter = fromSysPropertyOrAll("kotlin.js.test.phasesToDumpAfter", allPhasesSet),
+                    toValidateStateAfter = fromSysPropertyOrAll("kotlin.js.test.phasesToValidateAfter", allPhasesSet),
                     dumpOnlyFqName = null
                 )
             } else {
@@ -188,6 +189,13 @@ abstract class BasicIrBoxTest(
         }
     }
 
+    private fun fromSysPropertyOrAll(key: String, all: Set<AnyNamedPhase>): Set<AnyNamedPhase> {
+        val phases = System.getProperty(key)?.split(',')?.toSet() ?: emptySet()
+        if (phases.isEmpty()) return all
+
+        return all.filter { it.name in phases }.toSet()
+    }
+
     private fun JsCode.writeTo(outputFile: File, config: JsConfig) {
         val wrappedCode =
             wrapWithModuleEmulationMarkers(mainModule, moduleId = config.moduleId, moduleKind = config.moduleKind)