backend: implement '-linkerArg' to pass arguments to the linker

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

@@ -60,6 +60,8 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
             put(LIBRARY_FILES, 
                 arguments.libraries.toNonNullList())
 
+            put(LINKER_ARGS, arguments.linkerArguments.toNonNullList())
+
             put(NATIVE_LIBRARY_FILES,
                     arguments.nativeLibraries.toNonNullList())
 

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.java

@@ -28,6 +28,10 @@ public class K2NativeCompilerArguments extends CommonCompilerArguments {
     @Argument(value = "nolink", description = "Don't link, just produce a bitcode file")
     public boolean nolink;
 
+    @Argument(value = "linkerArg", description = "Add argument to linker")
+    @ValueDescription("<arg>")
+    public String[] linkerArguments;
+
     @Argument(value = "nostdlib", description = "Don't link with stdlib")
     public boolean nostdlib;