second part dominates all the blocks dominated
by original basic block. And first part dominates
second part.

llvm-svn: 40035

llvm-svn: 40034

llvm-gcc build to succeed. Without this change it fails in libstdc++
compilation. This causes no regressions in dejagnu tests. However, 
someone who knows this code better might want to review it.

llvm-svn: 39924

llvm-svn: 39921

llvm-svn: 39844

llvm-svn: 39744

llvm-svn: 38505

llvm-svn: 37952

by _GLIBCXX_DEBUG.

llvm-svn: 37796

from LoopSimplify.cpp to Dominator.cpp

llvm-svn: 37689

llvm-svn: 37545

llvm-svn: 37542

llvm-svn: 37541

llvm-svn: 37540

Now LoopSimplify does not require nor preserve ETForest.

llvm-svn: 37512

llvm-svn: 37506

llvm-svn: 37501

This allows faster immediate domiantor walk.

llvm-svn: 37500

This adds redundancy for now.

llvm-svn: 37492

llvm-svn: 37415

and create new node.

llvm-svn: 37414

llvm-svn: 37407

llvm-svn: 37403

llvm-svn: 37321

llvm-svn: 36994

llvm-svn: 36873

llvm-svn: 36662

Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652

llvm-svn: 36632

llvm-svn: 36444

llvm-svn: 36441

llvm-svn: 36299

llvm-svn: 36287

llvm-svn: 36272

llvm-svn: 36271

llvm-svn: 36258

llvm-svn: 36248

llvm-svn: 36247

llvm-svn: 36205

llvm-svn: 36199