Revert [CodeGen] Do the Simple Early Return in block-placement pass to optimize the...

Revert [CodeGen] Do the Simple Early Return in block-placement pass to optimize the blocks

This reverts r371177 (git commit f879c6875563c0a8cd838f1e13b14dd33558f1f8)

It caused PR43566 by removing empty, address-taken MachineBasicBlocks.
Such blocks may have references from blockaddress or other operands, and
need more consideration to be removed.

See the PR for a test case to use when relanding.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@373805 91177308-0d34-0410-b5e6-96231b3b80d8