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Make newCONSTSUB use the right warning scope.
newCONSTSUB uses the compile-time warning hints, instead of the run-
time hints. This means that
use warnings;
BEGIN {
no warnings;
some_XS_function_that_calls_new_CONSTSUB();
}
may trigger a redefinition warning, whereas it should be analogous to
use warnings;
BEGIN {
no warnings;
*foo = \&bar;
}
which does not warn.
newCONSTSUB localises PL_curcop and sets it to &PL_compiling. When it
does that, it needs to copy the hints over.
Running tests inside eval is not reliable without a test count, so I
added one.