[Bug translator/24327] @defined unable to handle $$parms and $$vars meta variables

["wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24327

--- Comment #2 from William Cohen <wcohen at redhat dot com> ---
This code is related to the automatic printing of global variables.  It can be
turned off and allows the reproducer to compile and run:

[wcohen@cervelo systemtap]$ stap  -e 'probe
kernel.statement("do_sys_open@fs/open.c:*") {if (@defined($$parms)) printf("%s
\n", $$parms); exit()}'
parse error: expected identifier or statistical operation
        saw: operator '-' at <input>:2:30
     source: foreach (__val = [__idx0] in -)
                                          ^
        in synthesized code from: identifier '$$parms' at <input>:1:65
     source: probe kernel.statement("do_sys_open@fs/open.c:*") {if
(@defined($$parms)) printf("%s \n", $$parms); exit()}
                                                                             ^

Segmentation fault (core dumped)
[wcohen@cervelo systemtap]$ stap  --no-global-var-display -e 'probe
kernel.statement("do_sys_open@fs/open.c:*") {if (@defined($$parms)) printf("%s
\n", $$parms); exit()}'
dfd=0xffffffffffffff9c filename=0x7fe33bffe6e0 flags=0x8000 mode=0x0

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