[PATCH] IPA ICF: handle IMAGPART_EXPR and REALPART_EXPR

[Martin Liška]

Hello.

As pointed out in the following PR64307, IPA ICF is missing support for 
aforementioned TREE types. Apart from that, the patch also fixes 
BIT_FIELD_REF, which was broken.

Tested on x86_64-linux-pc and no regression has been seen.

Ready for trunk?
Thanks,
Martin
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