reduce # const_casts, no functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67861 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index 47059d9..ef9dc76 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -580,8 +580,8 @@
   return const_cast<DeclContext*>(this)->lookup(Name);
 }
 
-const DeclContext *DeclContext::getLookupContext() const {
-  const DeclContext *Ctx = this;
+DeclContext *DeclContext::getLookupContext() {
+  DeclContext *Ctx = this;
   // Skip through transparent contexts.
   while (Ctx->isTransparentContext())
     Ctx = Ctx->getParent();