79095b4079
https://reviews.llvm.org/D133679 utilizes zstd's multithread API to create one single frame. This provides a higher compression ratio but is significantly slower than concatenating multiple frames. With manual parallelism, it is easier to parallelize memcpy in OutputSection::writeTo for parallel memcpy. In addition, as the individual allocated decompression buffers are much smaller, we can make a wild guess (compressed_size/4) without worrying about a resize (due to wrong guess) would waste memory.
See docs/NewLLD.rst