clang/test/Analysis/malloc-overflow2.c: Appease 32-bit targets.
clang/test/Analysis/malloc-overflow2.c: Appease 32-bit targets.

size_t is not unsigned long for targeting i686 (and Windows x64).

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@248458 91177308-0d34-0410-b5e6-96231b3b80d8

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