[clang] Consider aggregate bases when checking if an InitListExpr is constant (PR #80519)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 820f244aa92f11292e59440c9bc5afbdec395b20 c630eee1f930c87d2c461de92271c02de220b290 -- clang/lib/AST/Expr.cpp clang/test/SemaCXX/compound-literal.cpp clang/unittests/AST/ASTExprTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/unittests/AST/ASTExprTest.cpp b/clang/unittests/AST/ASTExprTest.cpp
index 257ac9c55d..5ec6aea8ed 100644
--- a/clang/unittests/AST/ASTExprTest.cpp
+++ b/clang/unittests/AST/ASTExprTest.cpp
@@ -28,12 +28,14 @@ using clang::tooling::buildASTFromCode;
 
 static IntegerLiteral *createIntLiteral(ASTContext &Ctx, uint32_t Value) {
   const int numBits = 32;
-  return IntegerLiteral::Create(Ctx, llvm::APInt(numBits, Value),
-                                Ctx.IntTy, {});
+  return IntegerLiteral::Create(Ctx, llvm::APInt(numBits, Value), Ctx.IntTy,
+                                {});
 }
 
-const CXXRecordDecl *getCXXRecordDeclNode(ASTUnit *AST, const std::string &Name) {
-  auto Result = match(cxxRecordDecl(hasName(Name)).bind("record"), AST->getASTContext());
+const CXXRecordDecl *getCXXRecordDeclNode(ASTUnit *AST,
+                                          const std::string &Name) {
+  auto Result =
+      match(cxxRecordDecl(hasName(Name)).bind("record"), AST->getASTContext());
   EXPECT_FALSE(Result.empty());
   return Result[0].getNodeAs<CXXRecordDecl>("record");
 }
@@ -89,9 +91,9 @@ TEST(ASTExpr, InitListIsConstantInitialized) {
   InitListExpr *BaseInit = new (Ctx) InitListExpr(Ctx, Loc, {}, Loc);
   BaseInit->setType(Ctx.getRecordType(Empty));
   Expr *Exprs[3] = {
-    BaseInit,
-    createIntLiteral(Ctx, 13),
-    createIntLiteral(Ctx, 42),
+      BaseInit,
+      createIntLiteral(Ctx, 13),
+      createIntLiteral(Ctx, 42),
   };
   InitListExpr *FooInit = new (Ctx) InitListExpr(Ctx, Loc, Exprs, Loc);
   FooInit->setType(Ctx.getRecordType(Foo));

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https://github.com/llvm/llvm-project/pull/80519