JVM Metadata: Add a bit to mark anonymous objects in inline functions

Anonymous objects in the scope of an inline functions are copied to
all call-sites. This makes them part of the public ABI of a Kotlin
library.

We introduce a flag to mark all classes in the scope of an inline
function. When compiling with assertions enabled, we check that
this flag is set whenever we inline an anonymous object from another
module.

compiler/frontend/src/org/jetbrains/kotlin/resolve/inline/InlineUtil.java

@@ -74,6 +74,17 @@ public class InlineUtil {
         return isInlineOrContainingInline(descriptor.getContainingDeclaration());
     }
 
+    public static boolean isInPublicInlineScope(@Nullable DeclarationDescriptor descriptor) {
+        if (descriptor == null) return false;
+        if (isInline(descriptor)) {
+            if (!(descriptor instanceof DeclarationDescriptorWithVisibility))
+                return false;
+            DescriptorVisibility visibility = ((DeclarationDescriptorWithVisibility) descriptor).getVisibility();
+            return !DescriptorVisibilities.isPrivate(visibility);
+        }
+        return isInPublicInlineScope(descriptor.getContainingDeclaration());
+    }
+
     public static boolean checkNonLocalReturnUsage(
             @NotNull DeclarationDescriptor fromFunction,
             @NotNull KtExpression startExpression,