x86: ZERO_UPPER_VEC_REGISTERS_RETURN_XTEST expect no transactions
Give fall-through path to `vzeroupper` and taken-path to `vzeroall`. Generally even on machines with RTM the expectation is the string-library functions will not be called in transactions. Reviewed-by:H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit c28db9cb)
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