In PR testsuite/102910 there was some discussion about alloca.h and
whether that header exists or whether 'alloca' is provided by stdlib.h
or ...

Well, some grepping showed that libgomp.oacc-c-c++-common/loop-gwv-2.c
also used 'alloca'. Solution: Do it like other testcases and use
__builtin_alloca. (I think this will fail on nvptx, but otherwise
it should now pass on more systems.)

I have only tested it on x86-64, where it passed before and after,
but I do see in gcc-testresults@ fails (even though I don't know
whether those fails are for this issue or others).

Committed as Rev. r12-4691.

Tobias
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