Andrew Trick a77ced8423 Add frontend flags for developers to easily control copy propagation: ...

-enable-copy-propagation: enables whatever form of copy propagation
 the current pipeline runs (mandatory-copy-propagation at -Onone,
 regular copy-propation at -O).

-disable-copy-propagation: similarly disables any form of copy
 propagation in the current pipelien.

2021-03-02 22:20:13 -08:00

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