[phobos] phobos commit, revision 2186

[Don Clugston]

Excellent! I predict this fails on AMD. (This test is a single instruction).

import std.math;

void main()
{
     assert( yl2x(0x1.0076fc5cc7933866p+40L, LN2) ==
0x1.bba4a9f774f49d0ap+4L, "YL2X fails");
}