[perl #58646] [TODO] convert 'new Failure' to '!FAIL'

[Patrick R. Michaud (via RT)]

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For rakudo builtin functions that are written in PIR, use

    .return '!FAIL'('...message...')

instead of the old-style

    $P0 = new 'Failure'
    .return ($P0)

Functions that have return exception handlers in place
(i.e., those written in Perl 6) should simply call 'fail' 
directly:

    fail '...';

Pm