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.kt

@@ -0,0 +1,11 @@
+
+// This code fails to link when bultins are taken from the 
+// frontend generated module, instead of our library.
+// Because the generated module doesn't see our name changing annotations,
+// the function names are all wrong.
+
+fun intrinsic(b: Int): Int {
+  var sum = 1
+  sum = sum + b
+  return sum
+}