[clang] [Clang] Fixed a crash when instantiating an invalid out-of-line static data member definition in a local class (PR #196772)

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


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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/SemaTemplate/gh176152.cpp clang/lib/Sema/SemaDecl.cpp --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index eedbaf425..3c5f2fa4a 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -4898,7 +4898,7 @@ void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
       VarDecl *Def = Old->getDefinition();
       if (Def && checkVarDeclRedefinition(Def, New))
         return;
-      if(Old->isInvalidDecl())
+      if (Old->isInvalidDecl())
         New->setInvalidDecl();
     }
   } else {

``````````

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https://github.com/llvm/llvm-project/pull/196772