Merging r280138:

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r280138 | jlpeyton | 2016-08-30 14:28:58 -0500 (Tue, 30 Aug 2016) | 5 lines

Appease older gcc compilers for the many-microtask-args.c test

Older gcc compilers error out with the C99 syntax of: for (int i =...)
so this change just moves the int i; declaration up above.

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llvm-svn: 287558