Switching the tests to use size_t instead of unsigned int to hopefully appease the Linux x64 build bot.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182906 91177308-0d34-0410-b5e6-96231b3b80d8
Switching the tests to use size_t instead of unsigned int to hopefully appease the Linux x64 build bot (take 2, forgot this test case).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182907 91177308-0d34-0410-b5e6-96231b3b80d8