[clang] [Clang] Do not warn on UTF-16 -> UTF-32 conversions. (PR #163927)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Sema/SemaChecking.cpp clang/test/SemaCXX/warn-implicit-unicode-conversions.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 26d56cc21..06da07877 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -12313,8 +12313,8 @@ static void DiagnoseMixedUnicodeImplicitConversion(Sema &S, const Type *Source,
   // Lone surrogates have a distinct representation in UTF-32.
   // Converting betweem UTF-16 and UTF-32 codepoint seems very widespread,
   // so don't warn on such conversion.
-  if(Source->isChar16Type() && Target->isChar32Type())
-      return;
+  if (Source->isChar16Type() && Target->isChar32Type())
+    return;
 
   Expr::EvalResult Result;
   if (E->EvaluateAsInt(Result, S.getASTContext(), Expr::SE_AllowSideEffects,

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https://github.com/llvm/llvm-project/pull/163927