Cleanup: remove artificial division between lookup results and const lookup
results. No-one was ever modifying a lookup result, and it would not be
reasonable to do so.

llvm-svn: 230123
diff --git a/clang/lib/AST/DeclObjC.cpp b/clang/lib/AST/DeclObjC.cpp
index d97c743..6e74784 100644
--- a/clang/lib/AST/DeclObjC.cpp
+++ b/clang/lib/AST/DeclObjC.cpp
@@ -54,8 +54,8 @@
 ///
 ObjCIvarDecl *
 ObjCContainerDecl::getIvarDecl(IdentifierInfo *Id) const {
-  lookup_const_result R = lookup(Id);
-  for (lookup_const_iterator Ivar = R.begin(), IvarEnd = R.end();
+  lookup_result R = lookup(Id);
+  for (lookup_iterator Ivar = R.begin(), IvarEnd = R.end();
        Ivar != IvarEnd; ++Ivar) {
     if (ObjCIvarDecl *ivar = dyn_cast<ObjCIvarDecl>(*Ivar))
       return ivar;
@@ -83,8 +83,8 @@
   // + (float) class_method;
   // @end
   //
-  lookup_const_result R = lookup(Sel);
-  for (lookup_const_iterator Meth = R.begin(), MethEnd = R.end();
+  lookup_result R = lookup(Sel);
+  for (lookup_iterator Meth = R.begin(), MethEnd = R.end();
        Meth != MethEnd; ++Meth) {
     ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(*Meth);
     if (MD && MD->isInstanceMethod() == isInstance)
@@ -101,8 +101,8 @@
 bool ObjCContainerDecl::HasUserDeclaredSetterMethod(
     const ObjCPropertyDecl *Property) const {
   Selector Sel = Property->getSetterName();
-  lookup_const_result R = lookup(Sel);
-  for (lookup_const_iterator Meth = R.begin(), MethEnd = R.end();
+  lookup_result R = lookup(Sel);
+  for (lookup_iterator Meth = R.begin(), MethEnd = R.end();
        Meth != MethEnd; ++Meth) {
     ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(*Meth);
     if (MD && MD->isInstanceMethod() && !MD->isImplicit())
@@ -161,8 +161,8 @@
         return nullptr;
   }
 
-  DeclContext::lookup_const_result R = DC->lookup(propertyID);
-  for (DeclContext::lookup_const_iterator I = R.begin(), E = R.end(); I != E;
+  DeclContext::lookup_result R = DC->lookup(propertyID);
+  for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
        ++I)
     if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(*I))
       return PD;