[clang] Fix missing initializer for inline static template member with auto caused by delayed template instantiation. (PR #138122)

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


:warning: C/C++ code formatter, clang-format found issues in your code. 
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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- 
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp 
clang/test/CodeGenCXX/cxx1z-inline-variables.cpp 
clang/test/SemaTemplate/cxx17-inline-variables.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp 
b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index eb66ec34a..c0a0feda6 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -6034,7 +6034,8 @@ void Sema::BuildVariableInstantiation(
   }
 
   // Figure out whether to eagerly instantiate the initializer.
-  if ((InstantiatingVarTemplate && !VarTemplateWithAutoType) || 
InstantiatingVarTemplatePartialSpec) {
+  if ((InstantiatingVarTemplate && !VarTemplateWithAutoType) ||
+      InstantiatingVarTemplatePartialSpec) {
     // We're producing a template. Don't instantiate the initializer yet.
   } else if (NewVar->getType()->isUndeducedType()) {
     // We need the type to complete the declaration of the variable.

``````````

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https://github.com/llvm/llvm-project/pull/138122
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