[clang] [CIR] Consume serialized LangOptions in post-CIRGen lowering (PR #225224)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/CIR/CodeGen/CIRGenModule.cpp clang/lib/CIR/Dialect/Transforms/LoweringPrepare.cpp clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.h clang/lib/CIR/Lowering/CIRPasses.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp b/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp
index 04afa8684..03044286e 100644
--- a/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp
+++ b/clang/lib/CIR/Dialect/Transforms/TargetLowering/LowerModule.cpp
@@ -97,7 +97,7 @@ std::unique_ptr<LowerModule> createLowerModule(mlir::ModuleOp module) {
   // Populate the lowering-relevant LangOptions from the module's
   // #cir.lowering_lang_options attribute so a reloaded .cir lowers the same
   // way it was compiled, without a live clang::LangOptions. When the attribute
-  // is absent (e.g. hand-written CIR) the defaults are kept; 
+  // is absent (e.g. hand-written CIR) the defaults are kept;
   clang::LangOptions langOpts;
   if (auto loweringLangOpts =
           mlir::dyn_cast_if_present<cir::LoweringLangOptionsAttr>(

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https://github.com/llvm/llvm-project/pull/225224