[PATCH, PR46032] Handle BUILT_IN_GOMP_PARALLEL in ipa-pta

[Tom de Vries]

Hi,

this patch fixes PR46032.

It handles a call:
...
   __builtin_GOMP_parallel (fn, data, num_threads, flags)
...
as:
...
   fn (data)
...
in ipa-pta.

This improves ipa-pta alias analysis in the parallelized function fn, 
and allows vectorization in the testcase without a runtime alias test.

Bootstrapped and reg-tested on x86_64.

OK for stage3 trunk?

Thanks,
- Tom
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