KT-6244 Overloads with no default parameters should take over ones with defaults

#KT-6244 Fixed

compiler/testData/diagnostics/tests/overload/defaultParameters.kt

@@ -0,0 +1,59 @@
+// !CHECK_TYPE
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_PARAMETER -UNUSED_VARIABLE
+
+fun simple() = 1
+fun simple(a: Int = 3) = ""
+
+fun twoDefault(a: Int = 2) = 1
+fun twoDefault(a: Any = 2, b: String = "") = ""
+
+fun <T> withGeneric(a: T) = 1
+fun <T> withGeneric(a: T, b: Int = 4) = ""
+
+fun <T> discriminateGeneric(a: T) = 1
+fun discriminateGeneric(a: Int, b: String = "") = ""
+
+fun <T: CharSequence> withDefaultGeneric(t: T, d: T? = null) = 1
+fun <T: Any> withDefaultGeneric(t: T, d: T? = null, a: Int = 1) = ""
+
+fun wrongTwoDefault(a: Any = 2) = 1
+fun wrongTwoDefault(a: Int = 2, b: String = "") = ""
+
+fun <T: Any> wrongWithDefaultGeneric(t: T, d: T? = null) = 1
+fun <T: CharSequence> wrongWithDefaultGeneric(t: T, d: T? = null, a: Int = 1) = ""
+
+fun wrong(a: Int = 1) {}
+fun wrong(a: String = "", b: Int = 1) {}
+
+fun test() {
+    val a = simple()
+    a checkType { _<Int>() }
+
+    val b = simple(1)
+    b checkType { _<String>() }
+
+    val c = twoDefault()
+    c checkType { _<Int>() }
+
+    val d = twoDefault(1)
+    d checkType { _<Int>() }
+
+    val e = twoDefault(1, "")
+    e checkType { _<String>() }
+
+    val f = withGeneric(3)
+    f checkType { _<Int>() }
+
+    val g = discriminateGeneric(1)
+    g checkType { _<String>() }
+
+    val h = withDefaultGeneric("")
+    h checkType { _<Int>() }
+
+
+    <!OVERLOAD_RESOLUTION_AMBIGUITY!>wrongTwoDefault<!>(1)
+
+    <!CANNOT_COMPLETE_RESOLVE!>wrongWithDefaultGeneric<!>("")
+
+    <!UNREACHABLE_CODE!><!OVERLOAD_RESOLUTION_AMBIGUITY!>wrong<!>(<!>null!!<!UNREACHABLE_CODE!>)<!>
+}

compiler/testData/diagnostics/tests/overload/defaultParameters.txt

@@ -0,0 +1,19 @@
+package
+
+internal fun </*0*/ T> discriminateGeneric(/*0*/ a: T): kotlin.Int
+internal fun discriminateGeneric(/*0*/ a: kotlin.Int, /*1*/ b: kotlin.String = ...): kotlin.String
+internal fun simple(): kotlin.Int
+internal fun simple(/*0*/ a: kotlin.Int = ...): kotlin.String
+internal fun test(): kotlin.Unit
+internal fun twoDefault(/*0*/ a: kotlin.Any = ..., /*1*/ b: kotlin.String = ...): kotlin.String
+internal fun twoDefault(/*0*/ a: kotlin.Int = ...): kotlin.Int
+internal fun </*0*/ T : kotlin.CharSequence> withDefaultGeneric(/*0*/ t: T, /*1*/ d: T? = ...): kotlin.Int
+internal fun </*0*/ T : kotlin.Any> withDefaultGeneric(/*0*/ t: T, /*1*/ d: T? = ..., /*2*/ a: kotlin.Int = ...): kotlin.String
+internal fun </*0*/ T> withGeneric(/*0*/ a: T): kotlin.Int
+internal fun </*0*/ T> withGeneric(/*0*/ a: T, /*1*/ b: kotlin.Int = ...): kotlin.String
+internal fun wrong(/*0*/ a: kotlin.Int = ...): kotlin.Unit
+internal fun wrong(/*0*/ a: kotlin.String = ..., /*1*/ b: kotlin.Int = ...): kotlin.Unit
+internal fun wrongTwoDefault(/*0*/ a: kotlin.Any = ...): kotlin.Int
+internal fun wrongTwoDefault(/*0*/ a: kotlin.Int = ..., /*1*/ b: kotlin.String = ...): kotlin.String
+internal fun </*0*/ T : kotlin.Any> wrongWithDefaultGeneric(/*0*/ t: T, /*1*/ d: T? = ...): kotlin.Int
+internal fun </*0*/ T : kotlin.CharSequence> wrongWithDefaultGeneric(/*0*/ t: T, /*1*/ d: T? = ..., /*2*/ a: kotlin.Int = ...): kotlin.String