Remove length based shape jit constructor and calculate_strides()

These work in tandem to create a shape via the calculate strides() call. Seemed
to introduce more issues than fix, since we don't have access to resize()

Right now this is cleanup but I had used rev_partial_sum and the multiplies()
template operator created in algorithm to achieve this during debugging for
gather. The idea here would be we would statically create array() with calculate_strides()
to fix the empty stride dimensions.

src/targets/gpu/kernels/include/migraphx/kernels/shape.hpp

@@ -39,23 +39,8 @@ struct shape
 
     constexpr shape() = default;
 
-    constexpr shape(Lens l) : lens(l) {shape{}.calculate_strides();}
-
     constexpr shape(Lens l, Strides s) : lens(l), strides(s) {}
 
-    constexpr auto calculate_strides()
-    {
-        strides.resize(lens.size(), 0);
-        if(strides.empty())
-            return;
-        strides.back() = 1;
-        partial_sum(lens.rbegin(),
-                         lens.rend() - 1,
-                         strides.rbegin() + 1,
-                         multiplies());
-    }
-
-
     constexpr auto elements() const { return _c<Lens{}.product()>; }
 
     constexpr auto element_space() const { return _c<Strides{}.dot(Lens{} - 1) + 1>; }