[PATCH] D115862: [LoongArch][test] (5/n) Add encoding and mnemonics tests

[Lu Weining via Phabricator via llvm-commits]

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With the benefit of D88392 <https://reviews.llvm.org/D88392>, instruction encoding and mnemonic testing can be
achieved within MIR files before AsmParser is ready. This patch adds such
tests which cover all basic integer instructions we defined in previous patch.
Similarly those tests will be rewrote by `.s` and moved to `test/MC/LoongArch`.

As https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#table-of-instruction-encoding
describes, LoongArch instructions are encoded as bits[0] to bits[31] from right
to left. For easy comparison we add a '--little-endian' option to
llvm/utils/extract-section.py with which we can print the instruction encoding
as it is.

Depends on D115861 <https://reviews.llvm.org/D115861>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115862

Files:
  llvm/test/CodeGen/LoongArch/1ri.mir
  llvm/test/CodeGen/LoongArch/2r.mir
  llvm/test/CodeGen/LoongArch/2ri.mir
  llvm/test/CodeGen/LoongArch/3r.mir
  llvm/test/CodeGen/LoongArch/3ri.mir
  llvm/test/CodeGen/LoongArch/lit.local.cfg
  llvm/test/CodeGen/LoongArch/misc.mir
  llvm/utils/extract-section.py

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