correct the -isystem option to not add the -isysroot path.  Only the weird
-iwithsysroot flag should do that.  This fixes rdar://8345942

llvm-svn: 111979
diff --git a/clang/lib/Frontend/InitHeaderSearch.cpp b/clang/lib/Frontend/InitHeaderSearch.cpp
index 55e3a42..1b6712f 100644
--- a/clang/lib/Frontend/InitHeaderSearch.cpp
+++ b/clang/lib/Frontend/InitHeaderSearch.cpp
@@ -912,7 +912,7 @@
   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
     Init.AddPath(E.Path, E.Group, false, E.IsUserSupplied, E.IsFramework,
-                 false);
+                 !E.IsSysRootRelative);
   }
 
   // Add entries from CPATH and friends.