Add addrspacecast instruction.

Patch by Michele Scandale!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194760 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index 570f927..835f643 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -26,6 +26,7 @@
 
 namespace llvm {
 
+class AddrSpaceCastInst;
 class AliasAnalysis;
 class AllocaInst;
 class BasicBlock;
@@ -720,6 +721,7 @@
   void visitPtrToInt(const User &I);
   void visitIntToPtr(const User &I);
   void visitBitCast(const User &I);
+  void visitAddrSpaceCast(const User &I);
 
   void visitExtractElement(const User &I);
   void visitInsertElement(const User &I);