[powerpc] __fesetround_inline optimizations
On POWER9, use more efficient means to update the 2-bit rounding mode via the 'mffscrn' instruction (instead of two 'mtfsb0/1' instructions or one 'mtfsfi' instruction that modifies 4 bits). Suggested-by:Paul E. Murphy <murphyp@linux.ibm.com> Reviewed-By:
Paul E Murphy <murphyp@linux.ibm.com>
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