Here goes stdlib separation.

$ gradlew backend.native:stdlib

builds you stdlib.kt.bc now.

The test runs are taught to supply
-library stdlib.kt.bc to kotlin compiler for proper imports resolution,
and then later stdlib.kt.bc is provided to clang for the final link step.

backend.native/tests/codegen/function/intrinsic-test.c

@@ -0,0 +1,10 @@
+extern void *resolve_symbol(const char*);
+
+int
+run_test() {
+  int (*intrinsic)(int) = resolve_symbol("kfun:intrinsic(Int)");
+
+  if (intrinsic(3) != 4) return 1;
+
+  return 0;
+}