compiler/cclasses.pas: replace Murmur3A with WyHash32
The previous time I suggested replacing 30 years old technology with a 10 years old one, but as it turned out there is a half year old one that is not particularly different on x86-32 but unconditionally better on 64 bits, giving like another 70% speedup, though smaller in absolute numbers after the first one. See
Patch: wy.patch.