Fix TargetParserTests for big-endian hosts #152407
                
     Merged
            
            
          
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The new
sys::detail::getHostCPUNameForARMfor Windows (#151596) was implemented using a C++ bit-field, which caused the associated unit tests to fail on big-endian machines as it assumed a little-endian layout.This change switches from the C++ bit-field to LLVM's
BitFieldtype instead.