[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}-->


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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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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