Adding fix to initialize a dim3 variable from blockIdx. (#1212)

Adding gitignore for ctags

include/hip/hcc_detail/hip_runtime.h

@@ -206,12 +206,15 @@ class Coordinates {
 
     struct X {
         __device__ operator R() const { return f(0); }
+        __device__ uint32_t operator=(R _) { return f(0); }
     };
     struct Y {
         __device__ operator R() const { return f(1); }
+        __device__ uint32_t operator=(R _) { return f(1); }
     };
     struct Z {
         __device__ operator R() const { return f(2); }
+        __device__ uint32_t operator=(R _) { return f(2); }
     };
 
    public:

include/hip/hcc_detail/hip_runtime_api.h

@@ -271,7 +271,7 @@ typedef struct dim3 {
     uint32_t y;  ///< y
     uint32_t z;  ///< z
 #ifdef __cplusplus
-    dim3(uint32_t _x = 1, uint32_t _y = 1, uint32_t _z = 1) : x(_x), y(_y), z(_z){};
+    __host__ __device__ dim3(uint32_t _x = 1, uint32_t _y = 1, uint32_t _z = 1) : x(_x), y(_y), z(_z){};
 #endif
 } dim3;