add hcc dialects sample

samples/0_Intro/hcc_dialects/vadd_hc_array.hc

@@ -0,0 +1,33 @@
+#include <hc.hpp>
+
+int main(int argc, char *argv[])
+{
+    int size = 1000000;
+
+    // Allocate auto-managed host/device views of data:
+    hc::array_view<float> A(size);
+    hc::array_view<float> B(size);
+    hc::array_view<float> C(size);
+
+    // Initialize host data
+    for (int i=0; i<size; i++) {
+        A[i] = 1.618f * i; 
+        B[i] = 3.142f * i;
+    }
+    C.discard_data(); // tell runtime not to copy CPU host data.
+
+
+    // Launch kernel onto default accelerator:
+    hc::parallel_for_each(hc::extent<1> (size),
+      [=] (hc::index<1> idx) [[hc]] { 
+        int i = idx[0];
+        C[i] = A[i] + B[i];
+    });
+
+    for (int i=0; i<size; i++) {
+        float ref= 1.618f * i + 3.142f * i;
+        if (C[i] != ref) {
+            printf ("error:%d computed=%6.2f, reference=%6.2f\n", i, C[i], ref);
+        }
+    };
+}