[CIR][NFC] Refactor code for populating LLVM conversion patterns #1152
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The function
populateCIRToLLVMConversionPatterns
contains a spaghetti of LLVM dialect conversion patterns, which results in merge conflicts very easily. Besides, a few patterns are even registered for more than once, possibly due to careless resolution of merge conflicts.This PR attempts to mitigate this problem. Pattern names now are sorted in alphabetical order, and each source code line now only lists exactly one pattern name to reduce potential merge conflicts.