Make sure to release the expressions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67027 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDeclCXX.cpp

@@ -2258,6 +2258,8 @@ Sema::DeclTy *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc,
     }
   }
   
+  assertexpr.release();
+  assertmessageexpr.release();
   Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 
                                         AssertExpr, AssertMessage);