cv32e40x
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[XIF] Implement synchronous exceptions
This task relates to finishing one of the known open items from https://github.com/openhwgroup/cv32e40x/pull/272:
- Synchronous exceptions within the coprocessor indicated by the result interface are ignored (they only inhibit writeback of the result).
- Update WB stage code to use 'generate if (X_EXT) begin : x_ext'
Make sure exceptions are handled by controller FSM.