Minor. Merge multiplatformTypeRefinement testdata with multiplatform testdata

idea/testData/multiplatform/simple/d1/d1.kt

@@ -0,0 +1,2 @@
+package foo
+expect class A

idea/testData/multiplatform/simple/d2/d2.kt

@@ -0,0 +1,4 @@
+package bar
+import foo.A
+
+fun baz(): A = null!!

idea/testData/multiplatform/simple/d3/d3.kt

@@ -0,0 +1,5 @@
+package foo
+
+actual class A {
+    fun foo() {}
+}

idea/testData/multiplatform/simple/d4/d4.kt

@@ -0,0 +1,6 @@
+package foobar
+import bar.baz
+
+fun main() {
+    baz().foo()
+}

idea/testData/multiplatform/simple/dependencies.txt

@@ -0,0 +1,8 @@
+MODULE d1 { platform=[JVM, JS, Native]; root=d1 }
+MODULE d2 { platform=[JVM, JS, Native]; root=d2 }
+MODULE d3 { platform=[JVM]; root=d3 }
+MODULE d4 { platform=[JVM]; root=d4 }
+
+d2 -> d1 { kind=DEPENDS_ON }
+d3 -> d2 { kind=DEPENDS_ON }
+d4 -> d3 { kind=DEPENDS_ON }