[clang] [CIR] Add undef handling to enable global lambdas (PR #169721)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/CIR/Dialect/IR/CIRDialect.cpp clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp clang/test/CIR/CodeGen/lambda.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
index 9e62317bf..1b9cf30b6 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
@@ -2054,10 +2054,11 @@ CIRToLLVMGlobalOpLowering::matchAndRewriteRegionInitializedGlobal(
     cir::GlobalOp op, mlir::Attribute init,
     mlir::ConversionPatternRewriter &rewriter) const {
   // TODO: Generalize this handling when more types are needed here.
-  assert((isa<cir::ConstArrayAttr, cir::ConstRecordAttr, cir::ConstVectorAttr,
-              cir::ConstPtrAttr, cir::ConstComplexAttr, cir::GlobalViewAttr,
-              cir::TypeInfoAttr, cir::VTableAttr, cir::UndefAttr,
-              cir::ZeroAttr>(init)));
+  assert(
+      (isa<cir::ConstArrayAttr, cir::ConstRecordAttr, cir::ConstVectorAttr,
+           cir::ConstPtrAttr, cir::ConstComplexAttr, cir::GlobalViewAttr,
+           cir::TypeInfoAttr, cir::VTableAttr, cir::UndefAttr, cir::ZeroAttr>(
+          init)));
 
   // TODO(cir): once LLVM's dialect has proper equivalent attributes this
   // should be updated. For now, we use a custom op to initialize globals
@@ -2116,8 +2117,7 @@ mlir::LogicalResult CIRToLLVMGlobalOpLowering::matchAndRewrite(
                          cir::ConstRecordAttr, cir::ConstPtrAttr,
                          cir::ConstComplexAttr, cir::GlobalViewAttr,
                          cir::TypeInfoAttr, cir::UndefAttr, cir::VTableAttr,
-                         cir::ZeroAttr>(
-                   init.value())) {
+                         cir::ZeroAttr>(init.value())) {
       // TODO(cir): once LLVM's dialect has proper equivalent attributes this
       // should be updated. For now, we use a custom op to initialize globals
       // to the appropriate value.

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https://github.com/llvm/llvm-project/pull/169721