[FIR] Don't load unneeded things

It's confusing to stop at breakpoints
related to these loadings when they aren't
actually used.

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/configuration/JsEnvironmentConfigurator.kt

@@ -70,10 +70,12 @@ class JsEnvironmentConfigurator(testServices: TestServices) : EnvironmentConfigu
             }
         }
 
-        private val METADATA_CACHE = (JsConfig.JS_STDLIB + JsConfig.JS_KOTLIN_TEST).flatMap { path ->
-            KotlinJavascriptMetadataUtils.loadMetadata(path).map { metadata ->
-                val parts = KotlinJavascriptSerializationUtil.readModuleAsProto(metadata.body, metadata.version)
-                JsModuleDescriptor(metadata.moduleName, parts.kind, parts.importedModules, parts)
+        private val METADATA_CACHE by lazy {
+            (JsConfig.JS_STDLIB + JsConfig.JS_KOTLIN_TEST).flatMap { path ->
+                KotlinJavascriptMetadataUtils.loadMetadata(path).map { metadata ->
+                    val parts = KotlinJavascriptSerializationUtil.readModuleAsProto(metadata.body, metadata.version)
+                    JsModuleDescriptor(metadata.moduleName, parts.kind, parts.importedModules, parts)
+                }
             }
         }
 

core/descriptors/src/org/jetbrains/kotlin/builtins/DefaultBuiltIns.kt

@@ -27,7 +27,8 @@ class DefaultBuiltIns(loadBuiltInsFromCurrentClassLoader: Boolean = true) : Kotl
 
     companion object {
         @JvmStatic
-        val Instance: DefaultBuiltIns =
+        val Instance: DefaultBuiltIns by lazy {
             DefaultBuiltIns()
+        }
     }
 }

core/descriptors/src/org/jetbrains/kotlin/types/error/ErrorModuleDescriptor.kt

@@ -20,7 +20,7 @@ object ErrorModuleDescriptor : ModuleDescriptor {
     override val expectedByModules: List<ModuleDescriptor> = emptyList()
     override val allExpectedByModules: Set<ModuleDescriptor> = emptySet()
     override val annotations: Annotations get() = Annotations.EMPTY
-    override val builtIns: KotlinBuiltIns = DefaultBuiltIns.Instance
+    override val builtIns: KotlinBuiltIns by lazy { DefaultBuiltIns.Instance }
     override val isValid: Boolean = false
 
     override fun <T> getCapability(capability: ModuleCapability<T>): T? = null