[Target] Added WithoutHost method

Author: Lunderberg

include/tvm/target/target.h

@@ -218,6 +218,9 @@ class Target : public ObjectRef {
    */
   static Target WithHost(const Target& target, const Target& host);
 
+  /*! \return The target with the host stripped out */
+  Target WithoutHost() const;
+
   /*!
    * \brief Returns true if \p this target represents an external codegen. If so,
    * \p this->kind->name can be used as the "Compiler" attribute on partitioned functions,

src/target/target.cc

@@ -662,6 +662,16 @@ Map<String, ObjectRef> TargetNode::Export() const {
 
 Optional<Target> TargetNode::GetHost() const { return this->host.as<Target>(); }
 
+Target Target::WithoutHost() const {
+  if ((*this)->GetHost()) {
+    auto output = make_object<TargetNode>(*get());
+    output->host = NullOpt;
+    return Target(output);
+  } else {
+    return *this;
+  }
+}
+
 int TargetNode::GetTargetDeviceType() const {
   if (Optional<Integer> device_type = GetAttr<Integer>("target_device_type")) {
     return Downcast<Integer>(device_type)->value;