llvm-svn: 39789

Remove the end-block handling code.  It was unsafe, and making it safe would have resulted in falling back to the slow DSE case.  I need to think some more about the right way to handle this.

llvm-svn: 39788

thanks Benoit Boissinot!

llvm-svn: 39774

llvm-svn: 39769

that structure.

Also, refactor the runOnBasicBlock() function, splitting some of the special cases into separate functions.

llvm-svn: 39762

of a function.

llvm-svn: 39754

llvm-svn: 39753

llvm-svn: 39747

as the current DSE, but it only a linear scan over each block, rather than quadratic.  Eventually
(once it has been improved somewhat), this will replace the current DSE.

NOTE: This has not yet been extensively tested.
llvm-svn: 38517