[clang] Update #embed directive completion placeholders and add test

Author: quanzhuo

clang/lib/Sema/SemaCodeComplete.cpp

@@ -10209,19 +10209,19 @@ void SemaCodeCompletion::CodeCompletePreprocessorDirective(bool InConditional) {
   Results.AddResult(Builder.TakeString());
 
   if (getLangOpts().C23) {
-    // #embed "header"
+    // #embed "file"
     Builder.AddTypedTextChunk("embed");
     Builder.AddChunk(CodeCompletionString::CK_HorizontalSpace);
     Builder.AddTextChunk("\"");
-    Builder.AddPlaceholderChunk("header");
+    Builder.AddPlaceholderChunk("file");
     Builder.AddTextChunk("\"");
     Results.AddResult(Builder.TakeString());
 
-    // #embed <header>
+    // #embed <file>
     Builder.AddTypedTextChunk("embed");
     Builder.AddChunk(CodeCompletionString::CK_HorizontalSpace);
     Builder.AddTextChunk("<");
-    Builder.AddPlaceholderChunk("header");
+    Builder.AddPlaceholderChunk("file");
     Builder.AddTextChunk(">");
     Results.AddResult(Builder.TakeString());
   }

clang/test/Index/complete-preprocessor.m

@@ -80,3 +80,8 @@
 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_COMPLETION_CACHING=1 c-index-test -code-completion-at=%s:9:8 %s | FileCheck -check-prefix=CHECK-CC3 %s
 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_COMPLETION_CACHING=1 c-index-test -code-completion-at=%s:11:5 %s | FileCheck -check-prefix=CHECK-CC4 %s
 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_COMPLETION_CACHING=1 c-index-test -code-completion-at=%s:14:5 %s | FileCheck -check-prefix=CHECK-CC5 %s
+
+// Test #embed completion in C23 mode
+// RUN: c-index-test -code-completion-at=%s:4:2 %s -std=c23 | FileCheck -check-prefix=CHECK-EMBED %s
+// CHECK-EMBED: NotImplemented:{TypedText embed}{HorizontalSpace  }{Text "}{Placeholder file}{Text "} (40)
+// CHECK-EMBED: NotImplemented:{TypedText embed}{HorizontalSpace  }{Text <}{Placeholder file}{Text >} (40)