Remove Sema::LookupObjCImplementation and replace it with just calling ObjCInterfaceDecl::getImplementation().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76509 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 7aa66f9..2f47c79 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -2067,8 +2067,7 @@
                                               const ObjCInterfaceDecl *IFace,
                                               const Selector &Sel) {
   ObjCMethodDecl *Method = 0;
-  if (ObjCImplementationDecl *ImpDecl 
-        = LookupObjCImplementation(IFace->getIdentifier()))
+  if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation())
     Method = ImpDecl->getInstanceMethod(Sel);
   
   if (!Method && IFace->getSuperClass())