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

[Lu Weining via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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SixWeining wrote:

It's better to put the test and future tests in a seperate sub-folder, like `GlobalISel`.

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