[clang] [clang][CodeComplete] Add code completion for if constexpr and consteval (PR #124315)

[Letu Ren via cfe-commits]

================
@@ -6749,6 +6749,55 @@ void SemaCodeCompletion::CodeCompleteInitializer(Scope 
*S, Decl *D) {
   CodeCompleteExpression(S, Data);
 }
 
+void SemaCodeCompletion::CodeCompleteIfConst(Scope *S,
+                                             bool AfterExclaim) const {
+  ResultBuilder Results(SemaRef, CodeCompleter->getAllocator(),
+                        CodeCompleter->getCodeCompletionTUInfo(),
+                        CodeCompletionContext::CCC_Other);
----------------
FantasqueX wrote:
![image](https://github.com/user-attachments/assets/4ba0669a-8495-46a0-9b48-9ff9bde4adca)
I think they are different. In `CodeCompleteAfterIf`, it's valid to provide a 
statement. While in the new added `CodeCompleteKeywordAfterIf ` only two 
keywords are appropriate.

https://github.com/llvm/llvm-project/pull/124315
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