FIR: implement -Xfriend-paths

compiler/testData/compileKotlinAgainstCustomBinaries/internalFromFriendModuleFir/library/a.kt

@@ -0,0 +1,15 @@
+package a
+
+internal interface InternalInterface
+
+public class PublicClass internal constructor() {
+    internal fun internalMemberFun() {}
+
+    internal companion object {}
+}
+
+internal val internalVal = ""
+
+internal fun internalFun(s: String): String = s
+
+internal typealias InternalTypealias = InternalInterface

compiler/testData/compileKotlinAgainstCustomBinaries/internalFromFriendModuleFir/output.txt

@@ -0,0 +1 @@
+OK

compiler/testData/compileKotlinAgainstCustomBinaries/internalFromFriendModuleFir/source.kt

@@ -0,0 +1,10 @@
+import a.*
+
+private fun test(i: InternalInterface): InternalTypealias {
+    PublicClass().internalMemberFun()
+    PublicClass.Companion
+
+    internalFun(internalVal)
+
+    return i
+}