Revert "CodeGen: Allow small copyable blocks to "break" the CFG."

This reverts commit ada6595a526d71df04988eb0a4b4fe84df398ded.

This needs a simple probability check because there are some cases where it is
not profitable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291695 91177308-0d34-0410-b5e6-96231b3b80d8
58 files changed