[Tests] Don't add additional files to every splitted module

^KT-79665
diff --git a/compiler/testData/codegen/box/coroutines/await.kt b/compiler/testData/codegen/box/coroutines/await.kt
index c9f4096..22992f6 100644
--- a/compiler/testData/codegen/box/coroutines/await.kt
+++ b/compiler/testData/codegen/box/coroutines/await.kt
@@ -1,7 +1,5 @@
 // WITH_STDLIB
 // WITH_COROUTINES
-// IGNORE_BACKEND_K2_MULTI_MODULE: JS_IR
-// ^^^ KT-79664: Error loading module 'kotlin_lib'. Its dependency 'kotlin_main' was not found. Please, check whether 'kotlin_main' is loaded prior to 'kotlin_lib'.
 // FILE: promise.kt
 import helpers.*
 import kotlin.coroutines.*
diff --git a/compiler/tests-common-new/testFixtures/org/jetbrains/kotlin/test/services/SplittingModuleTransformerForBoxTests.kt b/compiler/tests-common-new/testFixtures/org/jetbrains/kotlin/test/services/SplittingModuleTransformerForBoxTests.kt
index 1b99186..c4dde8d 100644
--- a/compiler/tests-common-new/testFixtures/org/jetbrains/kotlin/test/services/SplittingModuleTransformerForBoxTests.kt
+++ b/compiler/tests-common-new/testFixtures/org/jetbrains/kotlin/test/services/SplittingModuleTransformerForBoxTests.kt
@@ -57,7 +57,10 @@
         val firstModuleFiles = realFiles.filter { it != secondModuleFile }
         val firstModule = TestModule(
             name = "lib",
-            files = firstModuleFiles + additionalFiles,
+            files = firstModuleFiles + additionalFiles.filterNot {
+                // Avoid adding same global symbols, so deserializer
+                it.name == "jsCommonTestHelpers.kt" || it.name == "jsMinimalTestHelpers.kt"
+            },
             allDependencies = emptyList(),
             module.directives,
             module.languageVersionSettings
@@ -65,7 +68,10 @@
 
         val secondModule = TestModule(
             name = "main",
-            files = listOf(secondModuleFile) + additionalFiles.map { it.copy() },
+            files = listOf(secondModuleFile) + additionalFiles.filterNot {
+                // Avoid adding same global symbols, so deserializer
+                it.name == "CoroutineHelpers.kt" || it.name == "StateMachineChecker.kt" || it.name == "CoroutineUtil.kt"
+            }.map { it.copy() },
             allDependencies = listOf(DependencyDescription(firstModule, DependencyKind.Binary, DependencyRelation.FriendDependency)),
             RegisteredDirectivesBuilder(module.directives).apply {
                 -CodegenTestDirectives.IGNORE_FIR_DIAGNOSTICS
@@ -105,17 +111,6 @@
                     }
                 ) return true
             }
-        } else { // Klib backends
-            if (WITH_COROUTINES in moduleLib.directives) {
-                // KT-79665: WITH_COROUTINES works incorrectly for non-jvm multi-module tests, should EmptyContinuation object be referenced from moduleLib,
-                // or CHECK_STATE_MACHINE would add `val StateMachineChecker` to both modules
-                // Same helper sources `CoroutineHelpers.kt` and `CoroutineUtil.kt` are added to each module, which causes symbols clash in deserialization phase for moduleMain like:
-                //   IrClassSymbolImpl is already bound. Signature: helpers/EmptyContinuation|null[0]
-                if (CHECK_STATE_MACHINE in moduleLib.directives)
-                    return true
-                if (moduleLib.files[0].originalContent.contains("EmptyContinuation"))
-                    return true
-            }
         }
         return false // Don't skip its execution, since the test has been split, and no counter-patterns found
     }