minor refactoring to improve compile-time performance.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147963 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaObjCProperty.cpp

@@ -642,9 +642,9 @@ Decl *Sema::ActOnPropertyImplDecl(Scope *S,
     QualType PropertyIvarType = PropType.getNonReferenceType();
     
     if (getLangOptions().ObjCAutoRefCount &&
-        PropertyIvarType->isObjCRetainableType() &&
         (property->getPropertyAttributesAsWritten() &
-         ObjCPropertyDecl::OBJC_PR_readonly)) {
+         ObjCPropertyDecl::OBJC_PR_readonly) &&
+        PropertyIvarType->isObjCRetainableType()) {
       setImpliedPropertyAttributeForReadOnlyProperty(property, Ivar);    
     }