Make ObjCInterfaceDecl's const in some more places.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69775 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index 3ca625c..67b6e4c 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -1129,7 +1129,7 @@
                           getContext().getObjCGCAttrKind(E->getType()));
 }
 
-llvm::Value *CodeGenFunction::EmitIvarOffset(ObjCInterfaceDecl *Interface,
+llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
                                              const ObjCIvarDecl *Ivar) {
   return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
 }