567b195713
Red Bear OS supports exactly one CPU platform: amd64 (x86_64-unknown-redox). No 32-bit x86, AArch64, RISC-V. Clarify that LLVM's 'X86' target name IS amd64 (not 32-bit) and that GPU backends like AMDGPU are a separate axis from the CPU platform (radeonsi/radv need AMDGPU codegen; it doesn't add a second CPU arch).