Florian Hahn 67aa314bce [IRGen] Do not overwrite existing attributes in CGCall. ...

When adding new attributes, existing attributes are dropped. While
this appears to be a longstanding issue, this was highlighted by D105169
which dropped a lot of attributes due to adding the new noundef
attribute.

Ahmed Bougacha (@ab) tracked down the issue and provided the fix in
CGCall.cpp. I bundled it up and updated the tests.

2022-01-20 13:45:19 +00:00

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