[clang] [NFC][Sema] Move `Sema::AssignmentAction` into its own scoped enum (PR #106453)

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git-clang-format --diff 1601879f5d690595889a5537c0049b62df4657c7 f1f0975a05d1fe9dc9c1544888939a4a7f4e7633 --extensions cpp,h -- clang/include/clang/Sema/Sema.h clang/lib/Sema/SemaARM.cpp clang/lib/Sema/SemaCast.cpp clang/lib/Sema/SemaChecking.cpp clang/lib/Sema/SemaDeclCXX.cpp clang/lib/Sema/SemaExpr.cpp clang/lib/Sema/SemaExprCXX.cpp clang/lib/Sema/SemaInit.cpp clang/lib/Sema/SemaOpenMP.cpp clang/lib/Sema/SemaOverload.cpp clang/lib/Sema/SemaPseudoObject.cpp clang/lib/Sema/SemaStmt.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index e5b5c0fd11..789dc0d850 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -8822,8 +8822,9 @@ Expr *OpenMPIterationSpaceChecker::buildNumIterations(
           NewSize, Type->hasSignedIntegerRepresentation() ||
                        C.getTypeSize(Type) < NewSize);
       if (!SemaRef.Context.hasSameType(Diff.get()->getType(), NewType)) {
-        Diff = SemaRef.PerformImplicitConversion(
-            Diff.get(), NewType, AssignmentAction::Converting, /*AllowExplicit=*/true);
+        Diff = SemaRef.PerformImplicitConversion(Diff.get(), NewType,
+                                                 AssignmentAction::Converting,
+                                                 /*AllowExplicit=*/true);
         if (!Diff.isUsable())
           return nullptr;
       }

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https://github.com/llvm/llvm-project/pull/106453