[clang] Fix Lambda Mangling in Namespace-Scope Variable Initializers. (PR #159115)

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


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/test/CodeGenSYCL/unnamed-types.cpp clang/include/clang/Sema/Sema.h clang/lib/AST/ASTContext.cpp clang/lib/Sema/SemaLambda.cpp clang/test/CodeGenSYCL/unique_stable_name_windows_diff.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaLambda.cpp b/clang/lib/Sema/SemaLambda.cpp
index 3c241a59b..532424489 100644
--- a/clang/lib/Sema/SemaLambda.cpp
+++ b/clang/lib/Sema/SemaLambda.cpp
@@ -361,7 +361,7 @@ Sema::getCurrentMangleNumberContext(const DeclContext *DC) {
       // in the enclosing function context.
       if (isa<VarDecl>(ManglingContextDecl) &&
           !cast<VarDecl>(ManglingContextDecl)->hasGlobalStorage())
-          ManglingContextDecl = nullptr;
+        ManglingContextDecl = nullptr;
     }
     return std::make_tuple(nullptr, ManglingContextDecl);
   }

``````````

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https://github.com/llvm/llvm-project/pull/159115