math: add nextafter*, nextoward* and scalb to gen

[libc-test] / src / math / sanity / nextafterf.h

T(RN,   -0x1.0223ap+3,   0x1.22484cp+2,  -0x1.02239ep+3,          0x0p+0, 0)
T(RN,   0x1.161868p+2,  -0x1.1c6a6cp+3,   0x1.161866p+2,          0x0p+0, 0)
T(RN,  -0x1.0c34b4p+3,  -0x1.61bde2p+1,  -0x1.0c34b2p+3,          0x0p+0, 0)
T(RN,   -0x1.a206fp+2,    0x1.24528p+2,  -0x1.a206eep+2,          0x0p+0, 0)
T(RN,   0x1.288bbcp+3,   0x1.33eddap+2,   0x1.288bbap+3,          0x0p+0, 0)
T(RN,  -0x1.9ccd8cp+2,   0x1.52fb12p-1,  -0x1.9ccd8ap+2,          0x0p+0, 0)
T(RN,   0x1.f6f80ep+2,   0x1.ab3ff8p-5,   0x1.f6f80cp+2,          0x0p+0, 0)
T(RN,  -0x1.95882cp-1,   0x1.eb4a2ep+2,  -0x1.95882ap-1,          0x0p+0, 0)
T(RN,   0x1.3b3d62p-1,   0x1.018606p+1,   0x1.3b3d64p-1,          0x0p+0, 0)
T(RN,  -0x1.1e159ep-1,   0x1.081bd4p-5,  -0x1.1e159cp-1,          0x0p+0, 0)