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cranelift_module: Make it possible to enable isa flags on a per function base #1104

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@bjorn3

This is necessary for performant SIMD in cg_clif. This would correspond to for example #[target_feature(enable = "sse2")] in the compiled rust code.

https://doc.rust-lang.org/stable/core/arch/#dynamic-cpu-feature-detection

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    craneliftIssues related to the Cranelift code generator

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