[clang] [CIR] Source LoweringPrepare target facts from the module (PR #219078)

[Konstantinos Parasyris via cfe-commits]

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@@ -298,6 +299,14 @@ struct LoweringPreparePass
 
   clang::ASTContext *astCtx;
 
+  /// Target/ABI facts sourced from the module's own attributes.
+  std::unique_ptr<cir::LowerModule> lowerModule;
+
+  const clang::TargetInfo &getTargetInfo() const {
+    assert(lowerModule && "LoweringPrepare requires a module with a triple");
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koparasy wrote:

Not reachable: the CIRGen pipeline is the only caller and always sets the triple, plus the pass needs an ASTContext so it can't run standalone via cir-opt.

https://github.com/llvm/llvm-project/pull/219078