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

[Nathan Ridge via cfe-commits]

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@@ -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);
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HighCommander4 wrote:

Looking at the similar function `CodeCompleteAfterIf`, I think `mapCodeCompletionContext(SemaRef, PCC_Statement)` would be more appropriate here than `CodeCompletionContext::CCC_Other`

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