b4e1915517
This reapplies 3d0dd1a7d6, which was reverted in df2485b215a due to bot failures. This patch addresses the issues seen on the bots by disabling two Linux atexit tests in the ORC runtime whose behavior could not be maintained now that the ORC runtime is being loaded into a separate Platform JITDylib. https://github.com/llvm/llvm-project/issues/74641 has been filed to fix the issue with atexit.