[perl #60650] Lexical Associations Not Thawed with Tailcalls

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From t/pmc/exception.t test #26:

    .sub main :main
        .local pmc a
        .lex 'a', a
        a = new 'Integer'
        a = 42
        push_eh handler
        exit 0
    handler:
        .tailcall exit_handler()
    .end

    .sub exit_handler :outer(main)
        say "at_exit"
        .local pmc a
        a = find_lex 'a'
        print 'a = '
        say a
    .end

When run as PIR, the output shows that a is 42.  When compiled to PBC and run 
from PBC, this produces:

	at_exit
	a = Null PMC in say
	current instr.: 'exit_handler' pc 24 (t/op/exceptions_23.pir:17)

Remove .tailcall, recompile to PBC, and you get the correct answer.

-- c