Tests for "while" and "do-while" loop generation

backend.native/tests/build.gradle

@@ -142,6 +142,7 @@ task aritmetic(type: UnitKonanTest) {
 
 task sum1(type: UnitKonanTest) {
     source = "codegen/function/sum_foo_bar.kt"
+
 }
 
 task sum2(type: UnitKonanTest) {
@@ -210,3 +211,10 @@ task minus_eq(type: UnitKonanTest) {
     source = "codegen/function/minus_eq.kt"
 }
 
+task cycle(type: UnitKonanTest) {
+    source = "codegen/cycles/cycle.kt"
+}
+
+task cycle_do(type: UnitKonanTest) {
+    source = "codegen/cycles/cycle_do.kt"
+}

backend.native/tests/codegen/cycles/cycle-test.c

@@ -0,0 +1,11 @@
+extern void *resolve_symbol(const char*);
+
+int
+run_test() {
+  int (*cycle)(int) = resolve_symbol("kfun:cycle");
+
+  if (cycle(1) != 2) return 1;
+  if (cycle(0) != 1) return 1;
+
+  return 0;
+}

backend.native/tests/codegen/cycles/cycle.kt

@@ -0,0 +1,7 @@
+fun cycle(cnt: Int): Int {
+  var sum = 1
+  while (sum == cnt) {
+    sum = sum + 1
+  }
+  return sum
+}

backend.native/tests/codegen/cycles/cycle_do-test.c

@@ -0,0 +1,11 @@
+extern void *resolve_symbol(const char*);
+
+int
+run_test() {
+  int (*cycle_do)(int) = resolve_symbol("kfun:cycle_do");
+
+  if (cycle_do(3) != 5) return 1;
+  if (cycle_do(0) != 3) return 1;
+
+  return 0;
+}

backend.native/tests/codegen/cycles/cycle_do.kt

@@ -0,0 +1,7 @@
+fun cycle_do(cnt: Int): Int {
+  var sum = 1
+  do {
+    sum = sum + 2
+  } while (sum == cnt)
+  return sum
+}