[LoongArch] Change 'using namespace llvm;' to 'namespace llvm {' in LoongArchTargetParser.cpp. NFC
And change 'using namespace llvm::LoongArch' to 'namespace LoongArch {' to simplify the code a little bit.
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And change 'using namespace llvm::LoongArch' to 'namespace LoongArch {' to simplify the code a little bit.
mentioned in commit c4eb880d