[committed] Add objc exceptions tests

[Andrew Pinski <pinskia at physics dot uc dot edu>]

It is a good idea to run the objc exceptions in torture mode, so I 
copied
the run tests in objc.dg/try-catch-*.m to a new directory inside the 
objc/execute
directory.  With this, we now also get for "free" running the 
exceptions tests
on both the gnu runtime and next runtime on darwin.

Also this move shows we have some bugs in the optimizers which might be 
a
regression or not, I don't know.
This does adds about 15 unexpected failures on powerpc-darwin.
PR 23381 is tracking the next runtime failures.
PR 23306 is tacking local-variables-1.m failure.
The other two failures are caused by the loop unroller as it passes at
"-O3 -fomit-frame-pointer" but fails at "-O3 -fomit-frame-pointer 
-funroll-loops"
and I have not filed a bug about it yet.

It also removes the tests from objc.dg so we don't have duplicated 
tests.

Commited under my authority as libobjc maintainer (as I consider the 
objc
testsuite under both objc and libobjc).  The reason why this is suitable
for stage 3 is because it is just adding new tests and makes it easier
to add exceptions tests in the future (I am about to add another one 
after
I fix another bug).

Thanks,
Andrew Pinski

ChangeLog:
	* objc/execute/exceptions/exceptions.exp: New exp for the exceptions
	testsuite.
	* objc/execute/exceptions/trivial.m: New test.
	* objc.dg/try-catch-11.m: Move to ...
	* objc/execute/exceptions/foward-1.m: Here.
	* objc.dg/try-catch-2.m: Move to ...
	* objc/execute/exceptions/catchall-1.m: Here.
	* objc.dg/try-catch-8.m: Move to ...
	* objc/execute/exceptions/local-variables-1.m: Here.

Attachment: objcexceptions.diff.txt
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