SSAUpdater for the value from the first def may see uses of undefined values,
because the later defs will not have been updated yet.

llvm-svn: 103407

MachineSSAUpdater to avoid duplicating all the code.

llvm-svn: 103060

SSAUpdater.  I'm going to try to refactor this to share most of the code
between them.

llvm-svn: 102353

llvm-svn: 100215

llvm-svn: 95745

into TargetOpcodes.h.  #include the new TargetOpcodes.h
into MachineInstr.  Add new inline accessors (like isPHI())
to MachineInstr, and start using them throughout the 
codebase.

llvm-svn: 95687

Change errs() to dbgs().

llvm-svn: 92548

llvm-svn: 90816

llvm-svn: 90759

llvm-svn: 90744

llvm-svn: 90566

- If the reaching definition is an undef and the use is a PHI, add the implicit_def to the end of the source block.
- When reaching value is replaced with another, update the cache as well.

llvm-svn: 90501

llvm-svn: 90489

llvm-svn: 90395

llvm-svn: 90353