Make stack values for assignment-like operations lazy

As well as for other kinds of expressions

Within attached test they were generated twice in case of last expression of coroutine block,
because coroutine related codegen part is built upon assumption that all expressions should be generated lazily

Also add a test about unary postfix increment/decrement

 #KT-13156 Fixed

compiler/testData/codegen/box/coroutines/lastStatementInc.kt

@@ -0,0 +1,43 @@
+class Controller {
+    var wasHandleResultCalled = false
+    suspend fun suspendHere(x: Continuation<String>) {
+        x.resume("OK")
+    }
+
+    operator fun handleResult(x: Unit, y: Continuation<Nothing>) {
+        wasHandleResultCalled = true
+    }
+}
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>) {
+    val controller = Controller()
+    c(controller).resume(Unit)
+
+    if (!controller.wasHandleResultCalled) throw java.lang.RuntimeException("fail 1")
+}
+
+fun box(): String {
+    var result = 0
+
+    builder {
+        result++
+
+        if (suspendHere() != "OK") throw java.lang.RuntimeException("fail 2")
+
+        result--
+    }
+
+    if (result != 0) return "fail 3"
+
+    builder {
+        --result
+
+        if (suspendHere() != "OK") throw java.lang.RuntimeException("fail 4")
+
+        ++result
+    }
+
+    if (result != 0) return "fail 5"
+
+    return "OK"
+}

compiler/testData/codegen/box/coroutines/lastStementAssignment.kt

@@ -0,0 +1,45 @@
+class Controller {
+    var wasHandleResultCalled = false
+    suspend fun suspendHere(x: Continuation<String>) {
+        x.resume("OK")
+    }
+
+    operator fun handleResult(x: Unit, y: Continuation<Nothing>) {
+        wasHandleResultCalled = true
+    }
+}
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>) {
+    val controller = Controller()
+    c(controller).resume(Unit)
+
+    if (!controller.wasHandleResultCalled) throw java.lang.RuntimeException("fail 1")
+}
+
+var varWithCustomSetter: String = ""
+    set(value) {
+        if (field != "") throw java.lang.RuntimeException("fail 2")
+        field = value
+    }
+
+fun box(): String {
+    var result = ""
+
+    builder {
+        result += "O"
+
+        if (suspendHere() != "OK") throw java.lang.RuntimeException("fail 3")
+
+        result += "K"
+    }
+
+    if (result != "OK") return "fail 4"
+
+    builder {
+        if (suspendHere() != "OK") throw java.lang.RuntimeException("fail 5")
+
+        varWithCustomSetter = "OK"
+    }
+
+    return varWithCustomSetter
+}