[perl #125207] [JVM] Failing tests in S06-currying/assuming-and-mmd.t

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# New Ticket Created by  Christian Bartolomaeus 
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< bartolin>     j: say { $^a }.assuming(123)() # leads to spectest failures on 
JVM 
                (S06-currying/assuming-and-mmd.t)
<+camelia>      rakudo-jvm f1a21a: OUTPUT«Method 'Mu' not found for invocant of 
class 'Parcel'␤  in block 
                <unit> at /tmp/6T13UDTaeW:1␤␤»
< bartolin>     strangly, the following "patch" makes it work: 
                https://gist.github.com/usev6/d29f551093a704624663
< bartolin>     I have no idea why adding a line '1;' to 'method assuming' 
changes this ...
< FROGGS>       yeah, I guess it is an optimizer bug