Support inlining internal functions to friend modules in JS BE

There's one exception: if an inline internal function calls
private function, this will fail at run time.

js/js.translator/testData/box/inlineMultiModule/internalFriend.kt

@@ -0,0 +1,10 @@
+// EXPECTED_REACHABLE_NODES: 992
+// MODULE: lib
+// FILE: lib.kt
+internal fun bar() = "OK"
+
+internal inline fun foo() = bar()
+
+// MODULE: main(lib)(lib)
+// FILE: main.kt
+fun box(): String = foo()