don't generate direct increment and similar bytecodes for variables which are captured in closure (KT-1980)

compiler/testData/codegen/regressions/kt1980.kt

@@ -0,0 +1,29 @@
+import java.util.*
+
+public inline fun Int.times(body : () -> Unit) {
+    var count = this;
+    while (count > 0) {
+       body()
+       count--
+    }
+}
+
+fun calc() : Int {
+    val a = ArrayList<()->Int>()
+    2.times {
+        var j = 1
+        a.add({ j })
+        ++j
+    }
+    var sum = 0
+    for (f in a) {
+        val g = f as () -> Int
+        sum += g()
+    }
+    return sum
+}
+
+fun box() : String {
+    val x = calc()
+    return if (x == 4) "OK" else x.toString()
+}