tests: Add test for nested 'for' loops

backend.native/tests/build.gradle

@@ -337,6 +337,17 @@ task codegen_controlflow_for_loops_empty_range(type: RunKonanTest) {
     goldValue = "OK\n"
 }
 
+task codegen_controlflow_for_loops_nested(type: RunKonanTest) {
+    source = "codegen/controlflow/for_loops_nested.kt"
+    goldValue = "00 01 02 10 11 12 20 21 22 \n" +
+            "00 01 10 11 20 21 \n" +
+            "00 01 10 11 20 21 \n" +
+            "00 01 \n" +
+            "00 02 10 12 20 22 \n" +
+            "00 02 10 12 20 22 \n" +
+            "00 10 20 \n"
+}
+
 task local_variable(type: RunKonanTest) {
     source = "codegen/basics/local_variable.kt"
 }

backend.native/tests/codegen/controlflow/for_loops_nested.kt

@@ -0,0 +1,59 @@
+fun main(args: Array<String>) {
+    // Simple
+    for (i in 0..2) {
+        for (j in 0..2) {
+            print("$i$j ")
+        }
+    }
+    println()
+
+    // Break
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            print("$i$j ")
+            if (j == 1) break
+        }
+    }
+    println()
+
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            print("$i$j ")
+            if (j == 1) break@l2
+        }
+    }
+    println()
+
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            print("$i$j ")
+            if (j == 1) break@l1
+        }
+    }
+    println()
+
+    // Continue
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            if (j == 1) continue
+            print("$i$j ")
+        }
+    }
+    println()
+
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            if (j == 1) continue@l2
+            print("$i$j ")
+        }
+    }
+    println()
+
+    l1@for (i in 0..2) {
+        l2@for (j in 0..2) {
+            if (j == 1) continue@l1
+            print("$i$j ")
+        }
+    }
+    println()
+}