[Native] Export KDoc into generated native header

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -173,6 +173,8 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                 put(OVERRIDE_CLANG_OPTIONS, arguments.clangOptions.toNonNullList())
                 put(ALLOCATION_MODE, arguments.allocator)
 
+                put(EXPORT_KDOC, arguments.exportKDoc)
+
                 put(PRINT_IR, arguments.printIr)
                 put(PRINT_IR_WITH_DESCRIPTORS, arguments.printIrWithDescriptors)
                 put(PRINT_DESCRIPTORS, arguments.printDescriptors)

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt

@@ -181,6 +181,9 @@ class K2NativeCompilerArguments : CommonCompilerArguments() {
     )
     var libraryToAddToCache: String? = null
 
+    @Argument(value = "-Xexport-kdoc", description = "Export KDoc in framework header")
+    var exportKDoc: Boolean = false
+
     @Argument(value = "-Xprint-bitcode", deprecatedName = "--print_bitcode", description = "Print llvm bitcode")
     var printBitCode: Boolean = false