Convert RegisterAllocator interface to opaque pass type, so that users do not
need to know _anything_ about RegAlloc to use it.  Well in the end maybe.

llvm-svn: 1681
diff --git a/llvm/lib/Target/Sparc/Sparc.cpp b/llvm/lib/Target/Sparc/Sparc.cpp
index b4e0694..91e51d8 100644
--- a/llvm/lib/Target/Sparc/Sparc.cpp
+++ b/llvm/lib/Target/Sparc/Sparc.cpp
@@ -260,7 +260,7 @@
 
   //PM.add(new InstructionScheduling(*this));
 
-  PM.add(new RegisterAllocation(*this));
+  PM.add(getRegisterAllocator(*this));
   
   //PM.add(new OptimizeLeafProcedures());
   //PM.add(new DeleteFallThroughBranches());