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Prohibit capture of _ExtInt in inline assembly.

Authored by erichkeane on May 13 2020, 1:24 PM.

Description

Prohibit capture of _ExtInt in inline assembly.

The backends don't seem to properly handle the _ExtInt type in inline
assembly with crashes occurring in many. While the ones I tested seem to
work for powers of 2 < 64 (and some any multiple of 64 greater than
that), it seemed like a better idea to just use of this type in inline
assembly prohibited.

Details