ir: Put function attribute detection under an opt-in flag. #1467
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Given it was a considerable performance hit under some workloads. Closes rust-lang#1465.
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Although, bindgen needs .enable_function_attribute_detection() to process __attribute__((__warn_unused_result__)) because parsing attrs can be really slow in certain cases. Benches were performed to confirm our case doesn't face that issue. References: rust-lang/rust-bindgen#2149 rust-lang/rust-bindgen#1465 rust-lang/rust-bindgen#1466 rust-lang/rust-bindgen#1467
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Given it was a considerable performance hit under some workloads.
Closes #1465.