
Remove dead code related to "FPasses". This was a leftover from commit 7a5332b9b5584ce. Do not mention -enable-new-pm in error messages. The option does not exist any longer. Remove the addPass helper. Only one use remained, so we can just "inline" it manually to keep the code related to legacy PM a bit less spread out. Differential Revision: https://reviews.llvm.org/D148082