Kedeng/c++17 (apache#11)

* Fix build break in c++17

* Update HalideIR patch to workaround vs 2019 build

cmake/patches/halideIR.patch

@@ -1,3 +1,25 @@
+diff --git a/src/arithmetic/Interval.cpp b/src/arithmetic/Interval.cpp
+index f25a680..6991c25 100644
+--- a/src/arithmetic/Interval.cpp
++++ b/src/arithmetic/Interval.cpp
+@@ -116,7 +116,7 @@ Interval Interval::make_intersection(const Interval &a, const Interval &b) {
+ Expr Interval::pos_inf = Variable::make(Handle(), "pos_inf");
+ Expr Interval::neg_inf = Variable::make(Handle(), "neg_inf");
+
+-
++#if 0
+ namespace {
+ void check(Interval result, Interval expected, int line) {
+     internal_assert(equal(result.min, expected.min) &&
+@@ -198,7 +198,7 @@ void interval_test() {
+
+     std::cout << "Interval test passed" << std::endl;
+ }
+-
++#endif
+
+ }
+ }
 diff --git a/src/ir/IR.cpp b/src/ir/IR.cpp
 index 2c8bfa8..2948e88 100644
 --- a/src/ir/IR.cpp

src/relay/pass/alter_op_layout.cc

@@ -42,7 +42,7 @@ class TransformMemorizerNode : public Node {
  public:
   // map from (Expr, src_layout, dst_layout) to transformed Expr
   using TransformKey = std::tuple<const Node*, std::string, std::string>;
-  struct key_hash : public std::unary_function<TransformKey , std::size_t> {
+  struct key_hash {
     std::size_t operator()(const TransformKey& k) const {
       return dmlc::HashCombine<std::string>(dmlc::HashCombine<std::string>(
               std::hash<const Node*>()(std::get<0>(k)), std::get<1>(k)), (std::get<2>(k)));