Minor: move callable reference IR tests to a separate directory

compiler/testData/ir/irText/expressions/callableReferences/importedFromObject.kt

@@ -0,0 +1,14 @@
+package test
+
+import test.Foo.a
+import test.Foo.foo
+
+object Foo {
+    val a: String = ""
+    fun foo(): String = ""
+}
+
+val test1 = ::a
+val test1a = Foo::a
+val test2 = ::foo
+val test2a = Foo::foo