KT-2106 Mixed named and positional arguments should be allowed

#KT-2106 Fixed

compiler/testData/codegen/box/defaultArguments/function/mixingNamedAndPositioned.kt

@@ -0,0 +1,16 @@
+fun foo(a: String = "Default", b: Int = 1, c: Long = 2): String {
+  return "$a $b $c"
+}
+
+fun box(): String {
+  val test1 = foo("test1", 2, c = 3)
+  if (test1 != "test1 2 3") return test1
+
+  val test2 = foo("test2", c = 3)
+  if (test2 != "test2 1 3") return test2
+
+  val test3 = foo("test3", b = 3)
+  if (test3 != "test3 3 2") return test3
+
+  return "OK"
+}

compiler/testData/diagnostics/tests/NamedArgumentsAndDefaultValues.kt

@@ -18,8 +18,10 @@ fun test() {
     bar(""<!NO_VALUE_FOR_PARAMETER!>)<!>
     bar(1, 1, "")
     bar(1, 1, "")
-    bar(1, <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>z<!> = "")
-    bar(1, <!NAMED_PARAMETER_NOT_FOUND, MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>zz<!> = "",
+    bar(1, z = "")
+    bar(1, z = "", y = 2)
+    bar(z = "", <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>1<!>)
+    bar(1, <!NAMED_PARAMETER_NOT_FOUND!>zz<!> = "",
            <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!><!UNRESOLVED_REFERENCE!>zz<!>.<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>foo<!><!>
            <!NO_VALUE_FOR_PARAMETER!>)<!>
 }

compiler/testData/diagnostics/tests/checkArguments/kt1897_diagnostic_part.kt

@@ -18,7 +18,7 @@ fun test() {
 
     foo(i = 1, <!ARGUMENT_PASSED_TWICE!>i<!> = 1, s = <!ERROR_COMPILE_TIME_VALUE!>11<!>)
 
-    foo(<!TYPE_MISMATCH!>""<!>, <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>s<!> = <!ERROR_COMPILE_TIME_VALUE!>2<!>)
+    foo(<!TYPE_MISMATCH!>""<!>, s = <!ERROR_COMPILE_TIME_VALUE!>2<!>)
 
     foo(i = <!TYPE_MISMATCH!>""<!>, s = <!ERROR_COMPILE_TIME_VALUE!>2<!>, <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>33<!>)
 

compiler/testData/diagnostics/tests/checkArguments/kt1940.kt

@@ -4,6 +4,6 @@ package kt1940
 fun foo(<!UNUSED_PARAMETER!>i<!>: Int) {}
 
 fun test() {
-    foo(1, <!ARGUMENT_PASSED_TWICE, MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>i<!> = 2) //exception
+    foo(1, <!ARGUMENT_PASSED_TWICE!>i<!> = 2) //exception
     foo(i = 1, <!ARGUMENT_PASSED_TWICE!>i<!> = 2) //exception
 }