Fix signature of main() to use 'int' rather than 'int32_t'

For the XCore target's Newlib, the definition of 'int32_t' is
  "typedef signed long int32_t;"
'signed long' is not acceptable in main()'s signature.

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@200207 91177308-0d34-0410-b5e6-96231b3b80d8