631ea31585
Unbreak gcc 11 on powerpc64 by adding a missing header file (gnu-user.h in patch-gcc_config_gcc). Add PFRAG.powerpc64-main. The other changes are for D. Add powerpc64 to ONLY_FOR_ARCHS-dlang, and add enough PPC64 code to build libphobos. While adding fibers for powerpc64, also fix fibers for 32-bit powerpc, and pass MAP_STACK to mmap(2) for fibers on all archs. ok pascal@ (maintainer)