Add ir interpreter tests

compiler/testData/ir/interpreter/collections/mutableMapOf.kt

@@ -0,0 +1,6 @@
+import kotlin.*
+import kotlin.collections.*
+
+const val a1 = mutableMapOf(1 to "1", 2 to "2", 3 to "3").<!EVALUATED: `3`!>size<!>
+const val a2 = mutableMapOf(1 to "1", 2 to "2", 3 to "3").apply { remove(1) }.<!EVALUATED: `2`!>size<!>
+