[SYCL] Fix ranges to allow default constructor to 0s (#10676)

This addresses an expected change in the spec.

Signed-off-by: James Brodman <[email protected]>

Author: jbrodman

sycl/include/sycl/range.hpp

@@ -63,7 +63,7 @@ template <int Dimensions = 1> class range : public detail::array<Dimensions> {
   range(range<Dimensions> &&rhs) = default;
   range<Dimensions> &operator=(const range<Dimensions> &rhs) = default;
   range<Dimensions> &operator=(range<Dimensions> &&rhs) = default;
-  range() = delete;
+  range() = default;
 
 // OP is: +, -, *, /, %, <<, >>, &, |, ^, &&, ||, <, >, <=, >=
 #define __SYCL_GEN_OPT_BASE(op)                                                \

sycl/test/basic_tests/range.cpp

@@ -62,4 +62,12 @@ int main() {
   assert((two_dim_range--) == (two_dim_range_copy + 1));
   assert((three_dim_range++) == (three_dim_range_copy));
   assert((three_dim_range--) == (three_dim_range_copy + 1));
+
+  sycl::range<3> default3;
+  sycl::range<2> default2;
+  sycl::range<1> default1;
+
+  assert(default3[0] == 0 && default3[1] == 0 && default3[2] == 0);
+  assert(default2[0] == 0 && default2[1] == 0);
+  assert(default1[0] == 0);
 }