[patch] fix an openacc reduction test for PR68242

[Cesar Philippidis]

As stated in PR68242, the OpenACC libgomp reduction test reduction-2.c
has one test case involving a multiplication reduction which overflows
and that results in a failure on i686-linux host targets. This patch
adjusts the reduction size to prevent the overflow from happening. I've
also adjusted reduction-1.c because it can also overflow.

This patch has been tested on i686-linux and x86_64-linux. I'll apply
this patch to trunk as obvious shortly.

Cesar
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