[llvm] [LLVM] add LZMA for compression/decompression (PR #83297)

[Artem Belevich via llvm-commits]

Artem-B wrote:

This compression ratio cliff bothers me a bit. I wonder if there's something special about the data the benchmark was ran on that triggers it. for *both* compression algorithms. 

@yxsamliu would it be possible for you to rerun the benchmarks one more with the data set split into 1/3 and 2/3 of the original input in size and see if compression ratio cliff happens at lower compression levels for smaller inputs? 


https://github.com/llvm/llvm-project/pull/83297