[PATCH] Fix crash when serializing ObjCIvarDecl.

[Yiding Jia]

add a test

http://reviews.llvm.org/D4239

Files:
  lib/Serialization/ASTWriterDecl.cpp
  test/Index/index-pch-objc.m

Index: lib/Serialization/ASTWriterDecl.cpp
===================================================================
--- lib/Serialization/ASTWriterDecl.cpp
+++ lib/Serialization/ASTWriterDecl.cpp
@@ -1515,8 +1515,6 @@
   // ObjC Ivar
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
-  // getBackingIvarReferencedInAccessor
-  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
   // Type Source Info
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Index: test/Index/index-pch-objc.m
===================================================================
--- /dev/null
+++ test/Index/index-pch-objc.m
@@ -0,0 +1,10 @@
+// RUN: c-index-test -write-pch %t.pch %s
+// RUN: env LIBCLANG_NOTHREADS=1 c-index-test -index-tu %t.pch | FileCheck %s
+
+ at interface SomeClass
+ at property (retain) id foo;
+ at end
+ at implementation SomeClass
+ at end
+
+// CHECK: [indexDeclaration]: kind: objc-ivar | name: _foo
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