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

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 9d1fbbd2b9a00248eb8ea578c4047af4ec4da990 914e63cbc8ac24c808da647fe9516e1d10866c87 --extensions h,cpp -- clang/test/CodeCompletion/if-const.cpp clang/include/clang/Sema/SemaCodeCompletion.h clang/lib/Parse/ParseStmt.cpp clang/lib/Sema/SemaCodeComplete.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index b3351387ac..f4f3970cb6 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -6753,7 +6753,8 @@ void SemaCodeCompletion::CodeCompleteIfConst(Scope *S) const {
   ResultBuilder Results(SemaRef, CodeCompleter->getAllocator(),
                         CodeCompleter->getCodeCompletionTUInfo(),
                         CodeCompletionContext::CCC_Other);
-  CodeCompletionBuilder Builder(Results.getAllocator(), Results.getCodeCompletionTUInfo());
+  CodeCompletionBuilder Builder(Results.getAllocator(),
+                                Results.getCodeCompletionTUInfo());
   Results.EnterNewScope();
   if (getLangOpts().CPlusPlus17) {
     if (Results.includeCodePatterns()) {

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