[PATCH] aarch64 sim adds C flag bug fix

[Jim Wilson]

This fixes a problem where the C flag was incorrectly set when adding
a large negative value with a small positive value.  The word signed
result needs to be cast to unsigned to avoid a sign extension before
comparing with the double word unsigned result.

The modified testcase fails without the patch and works with the
patch.  This patch reduces GCC C testsuite unexpected failures from
1445 to 1439 (-6).

Jim
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