[CodeCompletion] Prioritize call argument pattern

struct Foo {
    init(_ arg1: String, arg2: Int) {}
    init(label: Int) {}
  }
  func test(strVal: String) {
    _ = Foo(<HERE>)
  }

In this case, 'strVal' was prioritized because it can use as an argument
for 'init(_:arg2:)'. However, argument labels are almost always
preferable, and if the user actually want 'strVal', they can input a few
characters to get it at the top. So we should always prioritize call
argument patterns.

rdar://77188260

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -158,7 +158,7 @@ bool SourceKit::CodeCompletion::addCustomCompletions(
     CodeCompletion::SwiftResult swiftResult(
         CodeCompletion::SwiftResult::ResultKind::Pattern,
         SemanticContextKind::ExpressionSpecific,
-        /*NumBytesToErase=*/0, completionString,
+        /*IsArgumentLabels=*/false, /*NumBytesToErase=*/0, completionString,
         CodeCompletionResult::ExpectedTypeRelation::Unknown);
 
     CompletionBuilder builder(sink, swiftResult);
@@ -666,6 +666,9 @@ static ResultBucket getResultBucket(Item &item, bool hasRequiredTypes,
       !skipMetaGroups)
     return ResultBucket::ExpressionSpecific;
 
+  if (completion->isArgumentLabels() && !skipMetaGroups)
+    return ResultBucket::ExpressionSpecific;
+
   if (completion->isOperator())
     return ResultBucket::Operator;
 
@@ -1167,13 +1170,15 @@ Completion *CompletionBuilder::finish() {
 
     if (current.getKind() == SwiftResult::Declaration) {
       base = SwiftResult(
-          semanticContext, current.getNumBytesToErase(), completionString,
+          semanticContext, current.isArgumentLabels(),
+          current.getNumBytesToErase(), completionString,
           current.getAssociatedDeclKind(), current.isSystem(),
           current.getModuleName(), current.getNotRecommendedReason(),
           current.getBriefDocComment(), current.getAssociatedUSRs(),
           current.getDeclKeywords(), typeRelation, opKind);
     } else {
       base = SwiftResult(current.getKind(), semanticContext,
+                         current.isArgumentLabels(),
                          current.getNumBytesToErase(), completionString,
                          typeRelation, opKind);
     }