Matt Arsenault 67ec8744d7 llc: Change behavior of -mattr with existing attribute ...

Append this to the existing target-features attribute on the function.

Some flags ignore existing attributes, and some overwrite them. Move
towards consistently respecting existing attributes if present. Since
target features act as a state machine on their own, append to the
function attribute. The backend default added feature list, function
attributes, and -mattr will all be appended together, and the later
features can individually toggle the earlier settings.

2020-01-15 19:46:01 -05:00

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