[clang] [CIR] Add pass_object_size hidden parameter support (PR #191482)

[Andy Kaylor via cfe-commits]

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@@ -2578,11 +2578,33 @@ mlir::Value CIRGenFunction::emitVAArg(VAArgExpr *ve) {
   return cir::VAArgOp::create(builder, loc, type, vaList);
 }
 
+/// Checks if using the result of __builtin_object_size(p, @p from) in place of
+/// __builtin_object_size(p, @p to) is correct.
+static bool areBOSTypesCompatible(int from, int to) {
+  return from == to || (from == 0 && to == 1) || (from == 3 && to == 2);
+}
+
 mlir::Value CIRGenFunction::emitBuiltinObjectSize(const Expr *e, unsigned type,
                                                   cir::IntType resType,
                                                   mlir::Value emittedE,
                                                   bool isDynamic) {
-  assert(!cir::MissingFeatures::opCallImplicitObjectSizeArgs());
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andykaylor wrote:

This should also be deleted from MissingFeatures.h now.

https://github.com/llvm/llvm-project/pull/191482