Remove the ref/value inconsistency in filter_decl_iterator.

filter_decl_iterator had a weird mismatch where both op* and op-> returned T*
making it difficult to generalize this filtering behavior into a reusable
library of any kind.

This change errs on the side of value, making op-> return T* and op* return
T&.

(reviewed by Richard Smith)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155808 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/LLVMConventionsChecker.cpp b/lib/StaticAnalyzer/Checkers/LLVMConventionsChecker.cpp
index 757a4ce..7e5720d 100644
--- a/lib/StaticAnalyzer/Checkers/LLVMConventionsChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/LLVMConventionsChecker.cpp
@@ -231,7 +231,7 @@
   for (RecordDecl::field_iterator I = R->field_begin(), E = R->field_end();
        I != E; ++I) {
     ASTFieldVisitor walker(R, BR);
-    walker.Visit(*I);
+    walker.Visit(&*I);
   }
 }
 
@@ -247,7 +247,7 @@
     const RecordDecl *RD = RT->getDecl()->getDefinition();
     for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end();
          I != E; ++I)
-      Visit(*I);
+      Visit(&*I);
   }
 
   FieldChain.pop_back();