[NFC][SYCL] Replace #pragma unroll with dim_loop in accessor.hpp (#6939)

The utility was introduced in #6560
because "#pragma unroll" doesn't always work and template-based solution
is much more reliable. Original PR only changed the loops that resulted
in immediate performance difference but other occurrences were missed.
This PR updates remaining ones. Note that I've found them by looking
into the LLVM IR produced by our device compiler and having the loop
really unrolled improves readability of such dumps (and most likely
codesize/perf, although not significantly).

Author: aelovikov-intel

sycl/include/sycl/accessor.hpp

@@ -1082,8 +1082,7 @@ class __SYCL_SPECIAL_CLASS __SYCL_TYPE(accessor) accessor :
   void __init(ConcreteASPtrType Ptr, range<AdjustedDim> AccessRange,
               range<AdjustedDim> MemRange, id<AdjustedDim> Offset) {
     MData = Ptr;
-#pragma unroll
-    for (int I = 0; I < AdjustedDim; ++I) {
+    detail::dim_loop<AdjustedDim>([&, this](size_t I) {
 #if __cplusplus >= 201703L
       if constexpr (!(PropertyListT::template has_property<
                         sycl::ext::oneapi::property::no_offset>())) {
@@ -1094,7 +1093,7 @@ class __SYCL_SPECIAL_CLASS __SYCL_TYPE(accessor) accessor :
 #endif
       getAccessRange()[I] = AccessRange[I];
       getMemoryRange()[I] = MemRange[I];
-    }
+    });
 
     // Adjust for offsets as that part is invariant for all invocations of
     // operator[]. Will have to re-adjust in get_pointer.
@@ -2362,9 +2361,8 @@ class __SYCL_SPECIAL_CLASS local_accessor_base :
   void __init(ConcreteASPtrType Ptr, range<AdjustedDim> AccessRange,
               range<AdjustedDim>, id<AdjustedDim>) {
     MData = Ptr;
-#pragma unroll
-    for (int I = 0; I < AdjustedDim; ++I)
-      getSize()[I] = AccessRange[I];
+    detail::dim_loop<AdjustedDim>(
+        [&, this](size_t I) { getSize()[I] = AccessRange[I]; });
   }
 
 public: