Make sure @property is allowed within a category.

Bug submitted by Keith Bauer.

CookieJar:Desktop keith$ cat test.m
#import <WebKit/WebKit.h>



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44007 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaDecl.cpp b/Sema/SemaDecl.cpp
index ec88087..3933963 100644
--- a/Sema/SemaDecl.cpp
+++ b/Sema/SemaDecl.cpp
@@ -1763,8 +1763,9 @@
   
   if (isa<RecordDecl>(static_cast<Decl *>(TagDecl)))
     NewFD = new FieldDecl(Loc, II, T, BitWidth);
-  else if (isa<ObjcInterfaceDecl>(static_cast<Decl *>(TagDecl))
-           || isa<ObjcImplementationDecl>(static_cast<Decl *>(TagDecl)))
+  else if (isa<ObjcInterfaceDecl>(static_cast<Decl *>(TagDecl)) ||
+           isa<ObjcImplementationDecl>(static_cast<Decl *>(TagDecl)) ||
+           isa<ObjcCategoryDecl>(static_cast<Decl *>(TagDecl)))
     NewFD = new ObjcIvarDecl(Loc, II, T);
   else
     assert(0 && "Sema::ActOnField(): Unknown TagDecl");