Make necessary changes to support DIV -> [SUF]Div. This changes llvm to
have three division instructions: signed, unsigned, floating point. The
bytecode and assembler are bacwards compatible, however.

llvm-svn: 31195

llvm-svn: 31156

llvm-svn: 30642

llvm-svn: 30598

llvm-svn: 30483

llvm-svn: 30451

llvm-svn: 30418

llvm-svn: 30399

_swap_16:
        slwi r2, r3, 24
        rlwimi r2, r3, 8, 8, 15
        srwi r3, r2, 16
        blr

now.

llvm-svn: 29864

llvm-svn: 29863

llvm-svn: 28572

llvm-svn: 28424

llvm-svn: 28402

llvm-svn: 28398

llvm-svn: 28384

llvm-svn: 27907

llvm-svn: 27337

llvm-svn: 27324

llvm-svn: 27321

llvm-svn: 27076

llvm-svn: 26950

llvm-svn: 26862

Make the PPC backend not dependent on BRTWOWAY_CC and make the branch
selector smarter about the code it generates, fixing a case in the
readme.

llvm-svn: 26814

llvm-svn: 26762

llvm-svn: 26754

llvm-svn: 26741

llvm-svn: 26728

llvm-svn: 26709

llvm-svn: 26708

llvm-svn: 26661

llvm-svn: 26583

llvm-svn: 26549

llvm-svn: 26536

llvm-svn: 26523

llvm-svn: 26513

llvm-svn: 26472

llvm-svn: 26299

llvm-svn: 26222

llvm-svn: 26217

llvm-svn: 26007