Support named arguments in their own position

^KT-7745 In Proggress

compiler/testData/codegen/box/mixedNamedPosition/defaults.kt

@@ -0,0 +1,23 @@
+// !LANGUAGE: +NewInference +MixedNamedArgumentsInTheirOwnPosition
+
+fun foo(
+    p1: Int = 1,
+    p2: String = "2",
+    p3: Double = 3.0,
+    p4: Char = '4'
+) = "$p1 $p2 ${p3.toInt()} $p4"
+
+fun box(): String {
+    if (foo(p1 = 1, "2", 3.0) != "1 2 3 4") return "fail 1"
+    if (foo(1, p2 = "2", 3.0) != "1 2 3 4") return "fail 2"
+    if (foo(1, "2", p3 = 3.0) != "1 2 3 4") return "fail 3"
+
+    if (foo(p1 = 1) != "1 2 3 4") return "fail 4"
+    if (foo(1, p2 = "2") != "1 2 3 4") return "fail 5"
+    
+    if (foo(p1 = 1, p2 = "2", 3.0) != "1 2 3 4") return "fail 6"
+
+    if (foo(1, p2 = "2") != "1 2 3 4") return "fail 7"
+
+    return "OK"
+}

compiler/testData/codegen/box/mixedNamedPosition/simple.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +NewInference +MixedNamedArgumentsInTheirOwnPosition
+
+fun foo(
+    p1: Int,
+    p2: String,
+    p3: Double
+) = "$p1 $p2 ${p3.toInt()}"
+
+fun box(): String {
+    if (foo(p1 = 1, "2", 3.0) != "1 2 3") return "fail 1"
+    if (foo(1, "2", p3 = 3.0) != "1 2 3") return "fail 2"
+    if (foo(p1 = 1, p2 = "2", 3.0) != "1 2 3") return "fail 3"
+
+    return "OK"
+}

compiler/testData/codegen/box/mixedNamedPosition/varargs.kt

@@ -0,0 +1,31 @@
+// !LANGUAGE: +NewInference +MixedNamedArgumentsInTheirOwnPosition
+
+fun foo1(
+    vararg p1: Int,
+    p2: String,
+    p3: Double
+) = "${p1[0]} ${p1[1]} $p2 ${p3.toInt()}"
+
+fun foo2(
+    p1: Int,
+    vararg p2: String,
+    p3: Double
+) = "$p1 ${p2[0]} ${p2[1]} ${p3.toInt()}"
+
+fun foo3(
+    p1: Int,
+    p2: String,
+    vararg p3: Double
+) = "$p1 $p2 ${p3[0].toInt()} ${p3[1].toInt()}"
+
+fun box(): String {
+    if (foo1(p1 = *intArrayOf(1, 2), "3", p3 = 4.0) != "1 2 3 4") return "fail 2"
+
+    if (foo2(p1 = 1, "2", "3", p3 = 4.0) != "1 2 3 4") return "fail 3"
+    if (foo2(1, p2 = *arrayOf("2", "3"), 4.0) != "1 2 3 4") return "fail 4"
+
+    if (foo3(p1 = 1, "2", 3.0, 4.0) != "1 2 3 4") return "fail 5"
+    if (foo3(p1 = 1, "2", p3 = *doubleArrayOf(3.0, 4.0)) != "1 2 3 4") return "fail 6"
+
+    return "OK"
+}