Use GCC builtins for roundeven functions if desired.
This patch is using the corresponding GCC builtin for roundevenf, roundeven and roundevenl if the USE_FUNCTION_BUILTIN macros are defined to one in math-use-builtins.h. These builtin functions is supported since GCC 10. The code of the generic implementation is not changed. Signed-off-by:Shen-Ta Hsieh <ibmibmibm.tw@gmail.com> Reviewed-by:
H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit eb906620)
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