PR libquadmath/65757
	* quadmath-imp.h (math_opt_barrier, math_force_eval,
	math_narrow_eval, math_check_force_underflow,
	math_check_force_underflow_nonneg): Define.
	* math/ceilq.c: Backport changes from upstream glibc
	between 2012-11-01 and 2017-07-13.
	* math/remquoq.c: Likewise.
	* math/expq.c: Likewise.
	* math/llroundq.c: Likewise.
	* math/logq.c: Likewise.
	* math/atanq.c: Likewise.
	* math/nearbyintq.c: Likewise.
	* math/scalblnq.c: Likewise.
	* math/finiteq.c: Likewise.
	* math/atanhq.c: Likewise.
	* math/expm1q.c: Likewise.
	* math/sinhq.c: Likewise.
	* math/log10q.c: Likewise.
	* math/rintq.c: Likewise.
	* math/roundq.c: Likewise.
	* math/fmaq.c: Likewise.
	* math/erfq.c: Likewise.
	* math/log2q.c: Likewise.
	* math/lroundq.c: Likewise.
	* math/j1q.c: Likewise.
	* math/scalbnq.c: Likewise.
	* math/truncq.c: Likewise.
	* math/frexpq.c: Likewise.
	* math/sincosq.c: Likewise.
	* math/tanhq.c: Likewise.
	* math/asinq.c: Likewise.
	* math/coshq.c: Likewise.
	* math/j0q.c: Likewise.
	* math/asinhq.c: Likewise.
	* math/floorq.c: Likewise.
	* math/sinq_kernel.c: Likewise.
	* math/powq.c: Likewise.
	* math/hypotq.c: Likewise.
	* math/sincos_table.c: Likewise.
	* math/rem_pio2q.c: Likewise.
	* math/nextafterq.c: Likewise.
	* math/log1pq.c: Likewise.
	* math/sincosq_kernel.c: Likewise.
	* math/tanq.c: Likewise.
	* math/acosq.c: Likewise.
	* math/lrintq.c: Likewise.
	* math/llrintq.c: Likewise.

From-SVN: r250343