[llvm] [LoongArch][GlobalISel] Adding initial GlobalISel infrastructure (PR #76912)

[via llvm-commits]

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+//===-- LoongArchRegisterBankInfo.h ---------------------------------*- C++
+//-*-===//
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GongMengyao wrote:

Already modified, thanks.

https://github.com/llvm/llvm-project/pull/76912