Objective-c++ IR gen.

Flag synthesized struct decl. as non-empty so
CXX side of ir gen does not skip its Null initialization.
Fixes radar 8027844 for objc++'s collection statement.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104837 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ASTContext.cpp

@@ -2856,6 +2856,9 @@ QualType ASTContext::getObjCFastEnumerationStateType() {
       Field->setAccess(AS_public);
       ObjCFastEnumerationStateTypeDecl->addDecl(Field);
     }
+    if (getLangOptions().CPlusPlus)
+      if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ObjCFastEnumerationStateTypeDecl))
+        CXXRD->setEmpty(false);
 
     ObjCFastEnumerationStateTypeDecl->completeDefinition();
   }

test/CodeGenObjCXX/foreach-statement.mm

@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
+// rdar: // 8027844
+
+// CHECK: call void @llvm.memset
+
+int main() {
+    id foo;
+    for (id a in foo) {
+    }
+}