[perl #60648] :immediate-declared Classes Not Thawed from PBC

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Given this PIR:

	.sub 'foo' :anon :immediate
	    $P0 = newclass 'Bar'
	.end

	.sub 'main' :main
	    $P0 = new 'Bar'
	    $P0.'hi'()
	.end

	.namespace [ 'Bar' ]

	.sub 'hi' :method
	    say "Hi!"
	.end

... the result is:

	Hi!

Now compile it to PBC:

	$ ./parrot -o no_thaw.pbc no_thaw.pir
	$ ./parrot no_thaw.pbc

	Class 'Bar' not found
	current instr.: 'main' pc 6 (no_thaw.pir:6)

See t/compilers/imcc/syn/hll.t #2 for a failing test.

-- c