[Bug translator/17587] New: too sensitive to duplicate globals across tapset files

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

https://sourceware.org/bugzilla/show_bug.cgi?id=17587

            Bug ID: 17587
           Summary: too sensitive to duplicate globals across tapset files
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com

It has been reported that the glib-supplied tapset files
{32,64}-gobject.stp are near-duplicates of one another,
specifically they contain identical

   global gtypes

If an end-user script causes both tapset files to be
processed, this results in

semantic error: conflicting global variables: identifier 'gtypes' at
/usr/share/systemtap/tapset/64-gobject.stp:1:8
        source: global gtypes
[...]

In this case, this error need not even be one: a single
global variable can be shared between the tapset files.
(If there were a type incompatibility, that would be
detected separately.)

Before we jump in with a big module/namespace system,
let's change that error to a warning, so this case is
handled similarly to the existing "cross-file global variable"
situation.  (Indeed, the original reported script
necessarily triggers both sets of diagnostics.)

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