add support for LoongArch to LLVMPipe (ORCJIT)
This MR adds detection of LoongArch to gallium architecture detection code, and then use it to add support for LoongArch to LLVMPipe ORCJIT (MCJIT is not available on LoongArch).
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This MR adds detection of LoongArch to gallium architecture detection code, and then use it to add support for LoongArch to LLVMPipe ORCJIT (MCJIT is not available on LoongArch).