[flang-rt] Fix for TIMEF test case hanging on Windows (#195651) The merging of PR https://github.com/llvm/llvm-project/pull/185377 caused a test case to hang on Windows. This PR fixes the same by adding an upper bound on the number of iterations of the test-loop, post which the test gracefully exits irrespective of whether the TIMEF functionality is supported on Windows or not.
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