[ARM] Generate build-attributes more correctly in the presence of intrinsic declarations. (#160749) This code doesn't work very well, but this makes it work when intrinsic definitions are present. It now discounts functions declarations from the set of attributes it looks at. The code would have worked better before 0ab5b5b8581d9f2951575f7245824e6e4fc57dec when module-level attributes could provide the information used to construct build-attributes.
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