[Hexagon] Add an option to use fast FP to int convert for some HVX cases (#169562) Lowering several flavors of fptosi for HVX can be done faster, but violates c/c++ convention on some arch tags. Nevertheless customers are using direct intrinsics with "incorrect" rounding mode and want compiler to do the same. Default behavior is not changed. Patch By: Fateme Hosseini Co-authored-by: Sergei Larin <slarin@codeaurora.org> Co-authored-by: Sergei Larin <slarin@qti.qualcomm.com>
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