Changed the fundemental architecture of Operands for Instructions. Now

Operands are maintained as a vector<Use> in the User class, and operator
iterators are provided as before.  Getting an operand no longer requires
a virtual function call.

WARNING: getOperand(x) where x >= getNumOperands() will now assert instead
of returning null!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/BasicBlock.h

@@ -28,11 +28,8 @@
 
 class Instruction;
 class Method;
-class BasicBlock;
 class TerminatorInst;
 
-typedef UseTy<BasicBlock> BasicBlockUse;
-
 class BasicBlock : public Value {       // Basic blocks are data objects also
 public:
   typedef ValueHolder<Instruction, BasicBlock> InstListType;