Top level functions inside module should be invoked using package$src class

compiler/testData/codegen/topLevelMemberInvocation/functionDifferentPackage/1.kt

@@ -0,0 +1,6 @@
+package a
+
+fun test1() {}
+
+// 2 INVOKESTATIC a/APackage\$src\$1\$[\-]*[0-9]*\.test1 \(\)V
+// 1 INVOKESTATIC b/BPackage\$src\$2\$[\-]*[0-9]*\.test2 \(\)V

compiler/testData/codegen/topLevelMemberInvocation/functionDifferentPackage/2.kt

@@ -0,0 +1,7 @@
+package b
+
+import a.test1
+
+fun test2() {
+    test1()
+}