It now correctly deletes unreachable blocks and blocks that are empty.

llvm-svn: 31000

llvm-svn: 30951

llvm-svn: 30950

llvm-svn: 30939

llvm-svn: 21420

Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137

llvm-svn: 15402

MachineBasicBlock* as a parameter so that nxext() and prior() helper
functions can work naturally on it.

llvm-svn: 15376

llvm-svn: 15375

MachineFunction::iterator instead of MachineBasicBlock* to avoid
dereferencing end iterators.

llvm-svn: 15373

FallThrough maybe == to MF.end().

llvm-svn: 15372

llvm-svn: 15368