[clang] [Clang] Add __datasizeof (PR #67805)

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

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``````````bash
git-clang-format --diff 5e1c2bf3e6fca35ee0445b2a81d47e8576024186 e6770ca7735285e1e669032a5a99b07709957803 -- clang/test/SemaCXX/datasizeof.cpp clang/lib/AST/ExprConstant.cpp clang/lib/AST/ItaniumMangle.cpp clang/lib/Parse/ParseExpr.cpp clang/lib/Sema/SemaExpr.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 0d3e8d63072e..50051e6c1185 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -16798,10 +16798,10 @@ ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
                             : diag::ext_offsetof_non_pod_type;
 
       if (!IsSafe && !DidWarnAboutNonPOD &&
-          DiagRuntimeBehavior(BuiltinLoc, nullptr,
-                              PDiag(DiagID)
-                              << SourceRange(Components[0].LocStart, OC.LocEnd)
-                              << CurrentType))
+          DiagRuntimeBehavior(
+              BuiltinLoc, nullptr,
+              PDiag(DiagID) << SourceRange(Components[0].LocStart, OC.LocEnd)
+                            << CurrentType))
         DidWarnAboutNonPOD = true;
     }
 

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https://github.com/llvm/llvm-project/pull/67805