Reinitialize thread0's stack base after enabling XSAVE.
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Authored by markj on May 8 2020, 12:13 AM.

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rS360812: Reinitialize thread0's stack base after enabling XSAVE.

Summary

Otherwise the initial call to set_top_of_stack(), which occurs before
fpuinit() sets the correct value for cpu_max_ext_state_size, leaves the
stack base at an incorrect location. Then, when the full area is
zeroed, we end up zeroing part of the BSP's DPCPU region.