Proposal to evaporate OBJC_INT_SELECTORS

[Stan Shebs <shebs at apple dot com>]

For a very long time, GCC's Objective-C frontend has included a
documented tm macro OBJC_INT_SELECTORS that is to be defined if
method selectors should be of type int rather than of type
struct objc_selector * (this matters because ObjC programs can
manipulate selectors and such at runtime).

However, this macro is never ever set by anything at all. The
oldtimers at Apple (including Steve Naroff, who originally
contributed ObjC to GCC) vaguely remember a time when method
selectors were not pointers, but it would have been quite some
time ago, perhaps as much as ten years, in GCC 1.x days.

So in order to simplify comprehension and maintenance of the ObjC
frontend, I propose to delete the macro and all references to
it.  If anybody knows of a reason to save it, now would be a
good time to speak up!

Stan