COMP: Fix problem with narrowing in c++11

modules/core/src/arithm.cpp:345:51:
error: constant expression evaluates to 4294967295 which cannot be narrowed to type 'int' [-Wc++11-narrowing]
static int CV_DECL_ALIGNED(16) v64f_absmask[] = { 0xffffffff, 0x7fffffff, 0xffffffff, 0x7fffffff };
                                                  ^~~~~~~~~~

Converted to unsigned int.  This variable is only used to initialize a bit pattern anywhy for a 128bit type.

modules/core/src/arithm.cpp

@@ -341,8 +341,8 @@ FUNCTOR_CLOSURE_2arg(VMax,  float, return _mm_max_ps(a, b));
 FUNCTOR_CLOSURE_2arg(VMax, double, return _mm_max_pd(a, b));
 
 
-static int CV_DECL_ALIGNED(16) v32f_absmask[] = { 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff };
-static int CV_DECL_ALIGNED(16) v64f_absmask[] = { 0xffffffff, 0x7fffffff, 0xffffffff, 0x7fffffff };
+static unsigned int CV_DECL_ALIGNED(16) v32f_absmask[] = { 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff };
+static unsigned int CV_DECL_ALIGNED(16) v64f_absmask[] = { 0xffffffff, 0x7fffffff, 0xffffffff, 0x7fffffff };
 
 FUNCTOR_TEMPLATE(VAbsDiff);
 FUNCTOR_CLOSURE_2arg(VAbsDiff,  uchar,

modules/core/src/ocl.cpp

@@ -4591,7 +4591,7 @@ struct Image2D::Impl
         CV_OclDbgAssert(err == CL_SUCCESS);
 
         size_t origin[] = { 0, 0, 0 };
-        size_t region[] = { src.cols, src.rows, 1 };
+        size_t region[] = { static_cast<size_t>(src.cols), static_cast<size_t>(src.rows), 1 };
 
         cl_mem devData;
         if (!alias && !src.isContinuous())
@@ -4599,7 +4599,7 @@ struct Image2D::Impl
             devData = clCreateBuffer(context, CL_MEM_READ_ONLY, src.cols * src.rows * src.elemSize(), NULL, &err);
             CV_OclDbgAssert(err == CL_SUCCESS);
 
-            const size_t roi[3] = {src.cols * src.elemSize(), src.rows, 1};
+            const size_t roi[3] = {static_cast<size_t>(src.cols) * src.elemSize(), static_cast<size_t>(src.rows), 1};
             CV_Assert(clEnqueueCopyBufferRect(queue, (cl_mem)src.handle(ACCESS_READ), devData, origin, origin,
                 roi, src.step, 0, src.cols * src.elemSize(), 0, 0, NULL, NULL) == CL_SUCCESS);
             CV_OclDbgAssert(clFlush(queue) == CL_SUCCESS);