[CodeCompletion] Fix a call to computeDefaultMap

Resolves SR-10795.

Author: hamishknight

lib/IDE/CodeCompletion.cpp

@@ -1457,9 +1457,8 @@ protocolForLiteralKind(CodeCompletionLiteralKind kind) {
 /// that is of type () -> ().
 static bool hasTrivialTrailingClosure(const FuncDecl *FD,
                                       AnyFunctionType *funcType) {
-  SmallBitVector defaultMap =
-    computeDefaultMap(funcType->getParams(), FD,
-                      /*level*/ FD->isInstanceMember() ? 1 : 0);
+  auto defaultMap = computeDefaultMap(funcType->getParams(), FD,
+                                      /*skipCurriedSelf*/ FD->hasCurriedSelf());
 
   if (defaultMap.size() - defaultMap.count() == 1) {
     auto param = funcType->getParams().back();

test/IDE/complete_trailing_closure.swift

@@ -56,6 +56,7 @@ func test1() {
 struct S {
   func method1(_: ()->()) {}
   static func method2(_: ()->()) {}
+  static func method3(_ a: Int = 0, _: ()->()) {}
   func nonTrivial1(_: (Int)->()) {}
   func nonTrivial2(_: @autoclosure ()->()) {}
   func test2() {
@@ -81,6 +82,7 @@ func test5() {
 }
 // STATIC_METHOD_1-NOT: {|}
 // STATIC_METHOD_1: Decl[StaticMethod]/CurrNominal:     method2 {|}[#Void#]
+// STATIC_METHOD_1: Decl[StaticMethod]/CurrNominal:     method3 {|}[#Void#]
 // STATIC_METHOD_1-NOT: {|}
 
 class C {