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

This reverts commit fee486e.

Author: whitneywhtsang

sycl/include/sycl/accessor.hpp

@@ -1084,7 +1084,8 @@ class __SYCL_SPECIAL_CLASS __SYCL_TYPE(accessor) accessor :
   void __init(ConcreteASPtrType Ptr, range<AdjustedDim> AccessRange,
               range<AdjustedDim> MemRange, id<AdjustedDim> Offset) {
     MData = Ptr;
-    detail::dim_loop<AdjustedDim>([&, this](size_t I) {
+#pragma unroll
+    for (int I = 0; I < AdjustedDim; ++I) {
 #if __cplusplus >= 201703L
       if constexpr (!(PropertyListT::template has_property<
                         sycl::ext::oneapi::property::no_offset>())) {
@@ -1095,7 +1096,7 @@ 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.
@@ -2414,8 +2415,9 @@ class __SYCL_SPECIAL_CLASS local_accessor_base :
   void __init(ConcreteASPtrType Ptr, range<AdjustedDim> AccessRange,
               range<AdjustedDim>, id<AdjustedDim>) {
     MData = Ptr;
-    detail::dim_loop<AdjustedDim>(
-        [&, this](size_t I) { getSize()[I] = AccessRange[I]; });
+#pragma unroll
+    for (int I = 0; I < AdjustedDim; ++I)
+      getSize()[I] = AccessRange[I];
   }
 
 public: