[clang] [CIR] Add BinOpOverflowOp and basic pointer arithmetic support (PR #133118)

[Andy Kaylor via cfe-commits]

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@@ -223,6 +223,16 @@ class CIRGenFunction : public CIRGenTypeCache {
 
   void emitDecl(const clang::Decl &d);
 
+  /// Same as IRBuilder::CreateInBoundsGEP, but additionally emits a check to
+  /// detect undefined behavior when the pointer overflow sanitizer is enabled.
+  /// \p SignedIndices indicates whether any of the GEP indices are signed.
+  /// \p IsSubtraction indicates whether the expression used to form the GEP
+  /// is a subtraction.
+  mlir::Value emitCheckedInBoundsGEP(mlir::Type elemTy, mlir::Value ptr,
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andykaylor wrote:

I'm reorganizing the emit functions in https://github.com/llvm/llvm-project/pull/133017. Can we hold this until that is merged?

https://github.com/llvm/llvm-project/pull/133118