[FIR] Consider JVM_TARGET in tests

compiler/config.jvm/src/org/jetbrains/kotlin/platform/jvm/JvmPlatform.kt

@@ -33,6 +33,8 @@ object JvmPlatforms {
 
     val jvm16: TargetPlatform = jvmTargetToJdkPlatform[JvmTarget.JVM_1_6]!!
     val jvm18: TargetPlatform = jvmTargetToJdkPlatform[JvmTarget.JVM_1_8]!!
+    val jvm9: TargetPlatform = jvmTargetToJdkPlatform[JvmTarget.JVM_9]!!
+    val jvm15: TargetPlatform = jvmTargetToJdkPlatform[JvmTarget.JVM_15]!!
 
     fun jvmPlatformByTargetVersion(targetVersion: JvmTarget): TargetPlatform =
         jvmTargetToJdkPlatform[targetVersion]!!

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/directives/ModuleStructureDirectives.kt

@@ -56,4 +56,8 @@ object ModuleStructureDirectives : SimpleDirectivesContainer() {
     val TARGET_PLATFORM by enumDirective<TargetPlatformEnum>(
         "Declares target platform for current module"
     )
+
+    val JVM_TARGET by stringDirective(
+        "Declares JVM target platform for current module"
+    )
 }

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/impl/ModuleStructureExtractorImpl.kt

@@ -236,6 +236,23 @@ class ModuleStructureExtractorImpl(
                         }
                     }
                 }
+                ModuleStructureDirectives.JVM_TARGET -> {
+                    if (currentModuleTargetPlatform != null) {
+                        assertions.fail { "Target platform already specified twice for module $currentModuleName" }
+                    }
+                    currentModuleTargetPlatform = if (values.size != 1) {
+                        assertions.fail { "JVM target should be single" }
+                    } else {
+                        when (values.single()) {
+                            "1.6" -> JvmPlatforms.jvm16
+                            "1.8" -> JvmPlatforms.jvm18
+                            "9" -> JvmPlatforms.jvm9
+                            "15" -> JvmPlatforms.jvm15
+                            else -> assertions.fail { "Incorrect value for JVM target" }
+                        }
+                    }
+                    return false // Workaround for FE and FIR
+                }
                 else -> return false
             }