SWDEV-265469 - added constexpr constructor for dim3

Change-Id: I2e23a403f272d1ff0ade24fec11190d2f3244e5f


[ROCm/clr commit: cee3e1aa37]

projects/clr/hipamd/include/hip/amd_detail/hip_runtime_api.h

@@ -313,7 +313,7 @@ typedef struct dim3 {
     uint32_t y;  ///< y
     uint32_t z;  ///< z
 #ifdef __cplusplus
-    __host__ __device__ dim3(uint32_t _x = 1, uint32_t _y = 1, uint32_t _z = 1) : x(_x), y(_y), z(_z){};
+    constexpr __host__ __device__ dim3(uint32_t _x = 1, uint32_t _y = 1, uint32_t _z = 1) : x(_x), y(_y), z(_z){};
 #endif
 } dim3;