[Platform API] Split TargetPlatform into lightweight TargetPlatform and CompilerServices

This decouples simple data (TargetPlatform) from other subsystem-specific
logic (like default imports, built-ins, etc.).

Aside from purely aesthetic improvements, it also makes it easier
to move 'TargetPlatform' into core (see next commits)

compiler/frontend.common/src/org/jetbrains/kotlin/analyzer/ModuleInfo.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.analyzer
 
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.PlatformDependentCompilerServices
 import org.jetbrains.kotlin.resolve.TargetPlatform
 
 
@@ -16,6 +17,7 @@ interface ModuleInfo {
     fun dependencies(): List<ModuleInfo>
     val expectedBy: List<ModuleInfo> get() = emptyList()
     val platform: TargetPlatform? get() = null
+    val compilerServices: PlatformDependentCompilerServices? get() = null
     fun modulesWhoseInternalsAreVisible(): Collection<ModuleInfo> = listOf()
     val capabilities: Map<ModuleDescriptor.Capability<*>, Any?>
         get() = mapOf(Capability to this)
@@ -28,7 +30,7 @@ interface ModuleInfo {
     // but if they are present, they should come after JVM built-ins in the dependencies list, because JVM built-ins contain
     // additional members dependent on the JDK
     fun dependencyOnBuiltIns(): ModuleInfo.DependencyOnBuiltIns =
-        platform?.dependencyOnBuiltIns() ?: ModuleInfo.DependencyOnBuiltIns.LAST
+        compilerServices?.dependencyOnBuiltIns() ?: ModuleInfo.DependencyOnBuiltIns.LAST
 
     //TODO: (module refactoring) provide dependency on builtins after runtime in IDEA
     enum class DependencyOnBuiltIns { NONE, AFTER_SDK, LAST }

compiler/frontend.common/src/org/jetbrains/kotlin/resolve/TargetPlatform.kt

@@ -14,6 +14,11 @@ import org.jetbrains.kotlin.storage.StorageManager
 import java.util.*
 
 abstract class TargetPlatform(val platformName: String) {
+    override fun toString() = platformName
+    abstract val platform: MultiTargetPlatform
+}
+
+abstract class PlatformDependentCompilerServices {
     private data class DefaultImportsKey(val includeKotlinComparisons: Boolean, val includeLowPriorityImports: Boolean)
 
     private val defaultImports = LockBasedStorageManager("TargetPlatform").let { storageManager ->
@@ -42,8 +47,6 @@ abstract class TargetPlatform(val platformName: String) {
         }
     }
 
-    override fun toString() = platformName
-
     abstract val platformConfigurator: PlatformConfigurator
 
     open val defaultLowPriorityImports: List<ImportPath> get() = emptyList()
@@ -60,8 +63,6 @@ abstract class TargetPlatform(val platformName: String) {
 
     open val excludedImports: List<FqName> get() = emptyList()
 
-    abstract val multiTargetPlatform: MultiTargetPlatform
-
     // This function is used in "cat.helm.clean:0.1.1-SNAPSHOT": https://plugins.jetbrains.com/plugin/index?xmlId=cat.helm.clean
     @Suppress("DeprecatedCallableAddReplaceWith", "unused")
     @Deprecated("Use getDefaultImports(LanguageVersionSettings, Boolean) instead.", level = DeprecationLevel.ERROR)