[KLIB] Implement new linker based on IdSignature

- Remove klib dependency on metadata and uniqID
 - Refactored proto format to make it more effective and compact
  -- Use special encoding for some types of data (coordinates, flags, types)
  -- Remove symbols table
  -- Use packed proto list if it is possible
 - Remove extension from metadata
 - Remove special ids for function interfaces
 - Fix klib IO
 - Fix incremental cache
 - General code clean up

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/ProtoEnumFlags.kt

@@ -108,4 +108,10 @@ object ProtoEnumFlags {
         ProtoBuf.Type.Argument.Projection.STAR ->
             throw IllegalArgumentException("Only IN, OUT and INV are supported. Actual argument: $projection")
     }
+
+    fun variance(variance: Variance) = when (variance) {
+        Variance.IN_VARIANCE -> TypeParameter.Variance.IN
+        Variance.OUT_VARIANCE -> TypeParameter.Variance.OUT
+        Variance.INVARIANT -> TypeParameter.Variance.INV
+    }
 }