Implement reduction of if statement to ternary conditional expression

js/js.translator/testData/inlineSizeReduction/cases/ternaryConditional.kt

@@ -0,0 +1,46 @@
+package foo
+
+// CHECK_VARS_COUNT: function=test1_za3lpa$ count=0
+// CHECK_VARS_COUNT: function=test2_za3lpa$ count=1
+// CHECK_VARS_COUNT: function=test3_za3lpa$ count=0
+
+inline fun a(x: Int) = b(x)
+
+fun b(x: Int) = x
+
+fun test1(n: Int) = if (n > 0) a(n + 10) else a(n - 10)
+
+fun test2(n: Int): Int {
+    var result = if (n > 0) a(n + 10) else a(n - 10)
+    return result
+}
+
+fun test3(n: Int): Int {
+    Holder.value = if (n > 0) a(n + 10) else a(n - 10)
+    return Holder.value
+}
+
+object Holder {
+    var value = 0
+}
+
+fun box(): String {
+    var result: Int
+
+    result = test1(5)
+    if (result != 15) return "fail1a: $result"
+    result = test1(-5)
+    if (result != -15) return "fail1b: $result"
+
+    result = test2(5)
+    if (result != 15) return "fail2a: $result"
+    result = test2(-5)
+    if (result != -15) return "fail2b: $result"
+
+    result = test3(5)
+    if (result != 15) return "fail3a: $result"
+    result = test3(-5)
+    if (result != -15) return "fail3b: $result"
+
+    return "OK"
+}