Subzero: Fix a build error against LLVM trunk.

src/IceInst.h

@@ -1161,6 +1161,15 @@ inline const Inst *iteratorToInst(InstList::const_iterator Iter) {
   return &*Iter;
 }
 
+inline InstList::iterator
+reverseToForwardIterator(InstList::reverse_iterator RI) {
+#ifdef PNACL_LLVM
+  return RI.base();
+#else  // !PNACL_LLVM
+  return ++RI.getReverse();
+#endif // !PNACL_LLVM
+}
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINST_H

src/IceTargetLoweringARM32.cpp

@@ -1703,7 +1703,7 @@ void TargetARM32::addEpilog(CfgNode *Node) {
 
   // Convert the reverse_iterator position into its corresponding (forward)
   // iterator position.
-  InstList::iterator InsertPoint = RI.base();
+  InstList::iterator InsertPoint = reverseToForwardIterator(RI);
   --InsertPoint;
   Context.init(Node);
   Context.setInsertPoint(InsertPoint);

src/IceTargetLoweringMIPS32.cpp

@@ -996,7 +996,7 @@ void TargetMIPS32::addEpilog(CfgNode *Node) {
 
   // Convert the reverse_iterator position into its corresponding (forward)
   // iterator position.
-  InstList::iterator InsertPoint = RI.base();
+  InstList::iterator InsertPoint = reverseToForwardIterator(RI);
   --InsertPoint;
   Context.init(Node);
   Context.setInsertPoint(InsertPoint);

src/IceTargetLoweringX86BaseImpl.h

@@ -1309,7 +1309,7 @@ void TargetX86Base<TraitsType>::addEpilog(CfgNode *Node) {
 
   // Convert the reverse_iterator position into its corresponding (forward)
   // iterator position.
-  InstList::iterator InsertPoint = RI.base();
+  InstList::iterator InsertPoint = reverseToForwardIterator(RI);
   --InsertPoint;
   Context.init(Node);
   Context.setInsertPoint(InsertPoint);