Optimized double-precision floating point functions

(Replacement) optimized implementations are provided of the following compiler built-ins and math library functions:

• __aeabi_dadd, __aeabi_ddiv, __aeabi_dmul, __aeabi_drsub, __aeabi_dsub, __aeabi_cdcmpeq, __aeabi_cdrcmple, __aeabi_cdcmple, __aeabi_dcmpeq, __aeabi_dcmplt, __aeabi_dcmple, __aeabi_dcmpge, __aeabi_dcmpgt, __aeabi_dcmpun, __aeabi_i2d, __aeabi_l2d, __aeabi_ui2d, __aeabi_ul2d, __aeabi_d2iz, __aeabi_d2lz, __aeabi_d2uiz, __aeabi_d2ulz, __aeabi_d2f
• sqrt, cos, sin, tan, atan2, exp, log, ldexp, copysign, trunc, floor, ceil, round, asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh, exp2, log2, exp10, log10, pow,, hypot, cbrt, fmod, drem, remainder, remquo, expm1, log1p, fma
• powint, sincos (GNU extensions)

The following additional optimized functions are also provided:

• fix2double, ufix2double, fix642double, ufix642double, double2fix, double2ufix, double2fix64, double2ufix64, double2int, double2int64, double2int_z, double2int64_z