Fix default argument method calls

In some cases, calls of methods with default arguments were invoked via the
actual generated method, not via the "...$default" accessor

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

@@ -0,0 +1,12 @@
+var result = "Fail"
+
+class A
+
+fun A.plusAssign(a: A, s: String = "OK") {
+    result = s
+}
+
+fun box(): String {
+    A() += A()
+    return result
+}

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

@@ -0,0 +1,14 @@
+var result = "Fail"
+
+class A
+
+fun A.plus(a: A, s: String = "OK"): A {
+    result = s
+    return this
+}
+
+fun box(): String {
+    var a = A()
+    a += A()
+    return result
+}

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

@@ -0,0 +1,3 @@
+fun Int.foo(o: String, k: String = "K") = o + k
+
+fun box() = 42 foo "O"

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

@@ -0,0 +1,5 @@
+class A
+
+fun A.plus(i: A, ok: String = "OK") = ok
+
+fun box() = A() + A()

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

@@ -0,0 +1,5 @@
+class A
+
+fun A.contains(i: A, actual: Boolean = true) = actual
+
+fun box() = if (A() in A()) "OK" else "Fail"