[WASM] DCE implementation

js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt

@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.ir.backend.js.codegen.CompilerOutputSink
 import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
 import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationOptions
 import org.jetbrains.kotlin.ir.backend.js.codegen.generateEsModules
+import org.jetbrains.kotlin.ir.backend.js.dce.eliminateDeadDeclarations
 import org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir.JsManglerDesc
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformerTmp

js/js.tests/test/org/jetbrains/kotlin/js/testOld/BasicWasmBoxTest.kt

@@ -33,7 +33,6 @@ import org.jetbrains.kotlin.psi.KtNamedFunction
 import org.jetbrains.kotlin.psi.KtPsiFactory
 import org.jetbrains.kotlin.resolve.CompilerEnvironment
 import org.jetbrains.kotlin.test.*
-import org.jetbrains.kotlin.test.directives.JsEnvironmentConfigurationDirectives
 import org.jetbrains.kotlin.test.util.KtTestUtil
 import java.io.Closeable
 import java.io.File
@@ -176,15 +175,14 @@ abstract class BasicWasmBoxTest(
             AnalyzerWithCompilerReport(config.configuration)
         )
 
-        val directives = KotlinTestUtils.parseDirectives(FileUtil.loadFile(testFile))
-
         val compilerResult = compileWasm(
             sourceModule,
             phaseConfig = phaseConfig,
             irFactory = IrFactoryImpl,
             exportedDeclarations = setOf(FqName.fromSegments(listOfNotNull(testPackage, testFunction))),
-            propertyLazyInitialization = directives.contains(JsEnvironmentConfigurationDirectives.PROPERTY_LAZY_INITIALIZATION.name),
+            propertyLazyInitialization = true,
             emitNameSection = true,
+            dceEnabled = true,
         )
 
         outputWatFile.write(compilerResult.wat)