[Codegen] Do not emit unneeded external accessor declarations

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/DescriptorUtils.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.ir.types.isUnit
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.resolve.annotations.argumentValue
 import org.jetbrains.kotlin.resolve.constants.StringValue
+import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
 /**
@@ -293,3 +294,6 @@ fun IrFunction.externalSymbolOrThrow(): String? {
 }
 
 val IrFunction.isBuiltInOperator get() = origin == IrBuiltIns.BUILTIN_OPERATOR
+
+fun IrDeclaration.isFromMetadataInteropLibrary() =
+        descriptor.module.isFromInteropLibrary()

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/LlvmDeclarations.kt

@@ -340,6 +340,9 @@ private class DeclarationsGeneratorVisitor(override val context: Context) :
 
         val llvmFunction = if (declaration.isExternal) {
             if (declaration.isTypedIntrinsic || declaration.isObjCBridgeBased()
+                    // All call-sites to external accessors to interop properties
+                    // are lowered by InteropLowering.
+                    || (declaration.isAccessor && declaration.isFromMetadataInteropLibrary())
                     || declaration.annotations.hasAnnotation(RuntimeNames.cCall)) return
 
             context.llvm.externalFunction(declaration.symbolName, llvmFunctionType,