Create HandlePHINodesInSuccessorBlocksFast, a version of

HandlePHINodesInSuccessorBlocks that works FastISel-style. This
allows PHI nodes to be updated correctly while using FastISel.

This also involves some code reorganization; ValueMap and
MBBMap are now members of the FastISel class, so they needn't
be passed around explicitly anymore. Also, SelectInstructions
is changed to SelectInstruction, and only does one instruction
at a time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55746 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/SelectionDAGISel.h

@@ -21,6 +21,7 @@
 #include "llvm/CodeGen/SelectionDAG.h"
 
 namespace llvm {
+  class FastISel;
   class SelectionDAGLowering;
   class SDValue;
   class MachineRegisterInfo;
@@ -118,6 +119,8 @@ private:
 
   void HandlePHINodesInSuccessorBlocks(BasicBlock *LLVMBB);
 
+  bool HandlePHINodesInSuccessorBlocksFast(BasicBlock *LLVMBB, FastISel *F);
+
   /// Pick a safe ordering for instructions for each target node in the
   /// graph.
   ScheduleDAG *Schedule();