JVM IR: improve ABI of properties in multifile facades

When copying top level declarations from multifile parts to facades,
also copy corresponding properties. This allows to keep their
annotations, which are later used in codegen (for example, to generate
ACC_DEPRECATED on property accessors), and allows to get rid of the hack
where the JVM name of the property accessor was computed prematurely via
methodSignatureMapper.

Also, don't copy `$annotations` methods for non-const properties to
facades because the old backend only generates them in parts (which
might be a separate problem, see KT-27644).

 #KT-40262 Fixed

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/MetadataSource.kt

@@ -14,7 +14,9 @@ interface MetadataSource {
     interface File : MetadataSource
     interface Class : MetadataSource
     interface Function : MetadataSource
-    interface Property : MetadataSource
+    interface Property : MetadataSource {
+        val isConst: Boolean
+    }
 }
 
 sealed class DescriptorMetadataSource : MetadataSource {
@@ -30,8 +32,12 @@ sealed class DescriptorMetadataSource : MetadataSource {
 
     class Function(override val descriptor: FunctionDescriptor) : DescriptorMetadataSource(), MetadataSource.Function
 
-    class Property(override val descriptor: PropertyDescriptor) : DescriptorMetadataSource(), MetadataSource.Property
+    class Property(override val descriptor: PropertyDescriptor) : DescriptorMetadataSource(), MetadataSource.Property {
+        override val isConst: Boolean get() = descriptor.isConst
+    }
 
     class LocalDelegatedProperty(override val descriptor: VariableDescriptorWithAccessors) : DescriptorMetadataSource(),
-        MetadataSource.Property
+        MetadataSource.Property {
+        override val isConst: Boolean get() = descriptor.isConst
+    }
 }