[Bug translator/12151] New: support /* stable */ embedded-c pragma

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

http://sourceware.org/bugzilla/show_bug.cgi?id=12151

           Summary: support /* stable */ embedded-c pragma
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sources.redhat.com
        ReportedBy: fche@redhat.com


The intent of this markup would be to allow the optimizer to
call the given embedded-c function more than once per probe
handler.  i.e:

probe foo { 
  println(pid())
  bar[pid()]=5
  println(zoo[pid(),execname()])
}

With current code, pid() would need to be called three times.
With the /* stable */ marker, it would be called once, and the
result memoized.

This would probably apply only to arity-0 functions, or perhaps
only to those with literal/stable parameters.

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