[hip] Make vector type's scalar conversion explicit.

[ROCm/hip commit: 9bb4ecfcfe]

projects/hip/include/hip/hcc_detail/hip_vector_types.h

@@ -114,7 +114,7 @@ THE SOFTWARE.
             typename U,
             typename std::enable_if<
                 std::is_convertible<U, T>{}>::type* = nullptr>
-        inline __host__ __device__
+        explicit inline __host__ __device__
         HIP_vector_type(U x) noexcept
         {
             for (auto i = 0u; i != rank; ++i) data[i] = x;
@@ -668,20 +668,20 @@ __MAKE_VECTOR_TYPE__(double, double);
 
 #define DECLOP_MAKE_ONE_COMPONENT(comp, type) \
     static inline __device__ __host__ \
-    type make_##type(comp x) { type r = {x}; return r; }
+    type make_##type(comp x) { type r{x}; return r; }
 
 #define DECLOP_MAKE_TWO_COMPONENT(comp, type) \
     static inline __device__ __host__ \
-    type make_##type(comp x, comp y) { type r = {x, y}; return r; }
+    type make_##type(comp x, comp y) { type r{x, y}; return r; }
 
 #define DECLOP_MAKE_THREE_COMPONENT(comp, type) \
     static inline __device__ __host__ \
-    type make_##type(comp x, comp y, comp z) { type r = {x, y, z}; return r; }
+    type make_##type(comp x, comp y, comp z) { type r{x, y, z}; return r; }
 
 #define DECLOP_MAKE_FOUR_COMPONENT(comp, type) \
     static inline __device__ __host__ \
     type make_##type(comp x, comp y, comp z, comp w) { \
-        type r = {x, y, z, w}; \
+        type r{x, y, z, w}; \
         return r; \
     }