Use correct module name when calling internal members from other module

This is needed to avoid using the same module name for test root as for
the main source root in the Gradle plugin, which is needed to fix
KT-18955

compiler/testData/compileKotlinAgainstKotlin/internalWithOtherModuleName.kt

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: NATIVE
+// FILE: A.kt
+
+package a
+
+class Box(val value: String) {
+    internal fun result(): String = value
+}
+
+// FILE: B.kt
+
+fun box(): String {
+    return a.Box("OK").result()
+}