1. There is now a "PAListPtr" class, which is a smart pointer around
   the underlying uniqued parameter attribute list object, and manages
   its refcount.  It is now impossible to mess up the refcount.
2. PAListPtr is now the main interface to the underlying object, and
   the underlying object is now completely opaque.
3. Implementation details like SmallVector and FoldingSet are now no
   longer part of the interface.
4. You can create a PAListPtr with an arbitrary sequence of
   ParamAttrsWithIndex's, no need to make a SmallVector of a specific 
   size (you can just use an array or scalar or vector if you wish).
5. All the client code that had to check for a null pointer before
   dereferencing the pointer is simplified to just access the 
   PAListPtr directly.
6. The interfaces for adding attrs to a list and removing them is a
   bit simpler.

Phase #2 will rename some stuff (e.g. PAListPtr) and do other less 
invasive changes.

llvm-svn: 48289

llvm-svn: 48255

add(Pass *) as a pure virtual member function. This will allow all
the various addPassesTo* functions in LLVM to avoid hard-coding what
type of PassManager is used. 

llvm-svn: 48226

llvm-svn: 48225

llvm-svn: 48198

llvm-svn: 48195

llvm-svn: 48193

llvm-svn: 48123

Add the ability to remove just one instance of a BB from a phi node. This fixes
the compile error in the tree now.

llvm-svn: 48085

llvm-svn: 48044

llvm-svn: 47922

llvm-svn: 47911

llvm-svn: 47908

llvm-svn: 47895

llvm-svn: 47857

is returning a struct value.

llvm-svn: 47848

llvm-svn: 47813

This is the first checkin for PR1269, the new EH infrastructure.

llvm-svn: 47802

llvm-svn: 47796

llvm-svn: 47792

llvm-svn: 47744

llvm-svn: 47700

llvm-svn: 47653

llvm-svn: 47637

llvm-svn: 47633

llvm-svn: 47619

llvm-svn: 47616

Remove unnecessary getOperand/setOperand overriders.
Simplify getReturnValue()

llvm-svn: 47614

Unify to ReturnInst::init() member functions.

llvm-svn: 47611

llvm-svn: 47607

llvm-svn: 47577

llvm-svn: 47514

llvm-svn: 47511

To support multiple return values, now ret instruction supports multiple operands instead of one aggregate operand.

llvm-svn: 47508

stuff into ParamAttrsList.h.  Per feedback from
ParamAttrs changes.

llvm-svn: 47504

the way through.  It is now used for codegen.

llvm-svn: 47484

llvm-svn: 47473

llvm-svn: 47472

llvm-svn: 47461

llvm-svn: 47460