MPP: Support multiple 'expectedBy' dependencies for single module

#KT-22865 Fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/ModuleDescriptor.kt

@@ -40,7 +40,7 @@ interface ModuleDescriptor : DeclarationDescriptor {
      */
     val allDependencyModules: List<ModuleDescriptor>
 
-    val expectedByModule: ModuleDescriptor?
+    val expectedByModules: List<ModuleDescriptor>
 
     fun <T> getCapability(capability: Capability<T>): T?
 

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/ModuleDescriptorImpl.kt

@@ -66,8 +66,8 @@ class ModuleDescriptorImpl @JvmOverloads constructor(
     override val allDependencyModules: List<ModuleDescriptor>
         get() = this.dependencies.sure { "Dependencies of module $id were not set" }.allDependencies.filter { it != this }
 
-    override val expectedByModule: ModuleDescriptor?
-        get() = this.dependencies.sure { "Dependencies of module $id were not set" }.expectedByDependency
+    override val expectedByModules: List<ModuleDescriptor>
+        get() = this.dependencies.sure { "Dependencies of module $id were not set" }.expectedByDependencies
 
     override fun getPackage(fqName: FqName): PackageViewDescriptor {
         assertValid()
@@ -111,7 +111,7 @@ class ModuleDescriptorImpl @JvmOverloads constructor(
     }
 
     fun setDependencies(descriptors: List<ModuleDescriptorImpl>, friends: Set<ModuleDescriptorImpl>) {
-        setDependencies(ModuleDependenciesImpl(descriptors, friends, null))
+        setDependencies(ModuleDependenciesImpl(descriptors, friends, emptyList()))
     }
 
     override fun shouldSeeInternalsOf(targetModule: ModuleDescriptor): Boolean {
@@ -150,11 +150,11 @@ class ModuleDescriptorImpl @JvmOverloads constructor(
 interface ModuleDependencies {
     val allDependencies: List<ModuleDescriptorImpl>
     val modulesWhoseInternalsAreVisible: Set<ModuleDescriptorImpl>
-    val expectedByDependency: ModuleDescriptorImpl?
+    val expectedByDependencies: List<ModuleDescriptorImpl>
 }
 
 class ModuleDependenciesImpl(
     override val allDependencies: List<ModuleDescriptorImpl>,
     override val modulesWhoseInternalsAreVisible: Set<ModuleDescriptorImpl>,
-    override val expectedByDependency: ModuleDescriptorImpl?
+    override val expectedByDependencies: List<ModuleDescriptorImpl>
 ) : ModuleDependencies

core/descriptors/src/org/jetbrains/kotlin/types/ErrorUtils.java

@@ -85,10 +85,10 @@ public class ErrorUtils {
                 return emptyList();
             }
 
-            @Nullable
+            @NotNull
             @Override
-            public ModuleDescriptor getExpectedByModule() {
-                return null;
+            public List<ModuleDescriptor> getExpectedByModules() {
+                return emptyList();
             }
 
             @Override