[SYCL] Fix multi_ptr ctor for extended address spaces #9869
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The sycl_ext_usm_address_spaces extension adds the ext_intel_global_device_space address space together with additional multi_ptr constructors for creating a multi_ptr from an accessor. However, the current implementation fails to construct the multi_ptr from an accessor when the extended address space decorations are enabled (through ENABLE_USM_ADDR_SPACE) as it attempts to use the normal global address space decoration.
This commit fixes these constructors by doing a legal cast of the underlying global-space pointer to a ext_intel_global_device_space decorated pointer.