Forward ports from 9.4 release

This ports a few things from the 9.4 branch forward to master:

• Bump the version numbers of base and ghc-prim (along with the needed submodule bumps)
• Fix T7275's use of sed, which was incompatible with BSD sed
• Ensure that artifacts are preserved for failing jobs
• Don't run the -make job in release pipelines
• Fix the name of the root directory of (Hadrian-built) Windows bindists
• Update the supported LLVM version range to match that of 9.2