objc/5956: selectors aren't matched properly when added to the selector table

[alexander@malmberg.org]

>Number:         5956
>Category:       objc
>Synopsis:       selectors aren't matched properly when added to the selector table
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          pessimizes-code
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 13 17:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Alexander Malmberg
>Release:        gcc version 3.0.3
>Organization:
>Environment:

>Description:
Due to a simple mixup, build_typed_selector_reference() won't properly match the new selector with existing selectors (TREE_PURPOSE() and TREE_VALUE()) are mixed up).

This doesn't cause incorrect code, but the selector tables are unnecessarily large; it bloats all objective-c code (by approximately 10% in the cases I've measured).

I've attached a patch that fixes this.
>How-To-Repeat:
Compile any program that contains two references to the same selector, eg:

[someobject foo];
[someobject foo];

The resulting selector table will have to entries for 'foo'.
>Fix:
Apply the patch.
>Release-Note:
>Audit-Trail:
>Unformatted:
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