FindOpenMP: Use -Qiopenmp instead of -fiopenmp for IntelLLVM on Windows

The Windows driver does not like the `-f` form of this option.

Note that we prefer `-Qiopenmp/-fiopenmp` over `-Qopenmp/-fopenmp` in
order to generate LLVM IR with parallelization information, which the
backend uses to generate parallelized code.

Signed-off-by: William R. Dieter <>
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