[SYCL] Account for -ffine-grained-bitfield-accesses - #23007
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When community added support for [[gcc_struct]], the code flow path in accumulateBitFields changed. On Windows, we began to always try to merge contiguous bitfields of the same type into one storage block. As a result, the bit-field "split" that was otherwise performed when the option -ffine-grained-bitfield-accesses was enabled, was no longer done. This leads to performance differences for some cases.
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When community added support for [[gcc_struct]], the code flow path in accumulateBitFields changed. On Windows, we began to always try to merge contiguous bitfields of the same type into one storage block. As a result, the bit-field "split" that was otherwise performed when the option -ffine-grained-bitfield-accesses was enabled, was no longer done.
This leads to performance differences for some cases.