[ESIMD] Conditionally revert the recent changes for slm_gather() #12341
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The previous fix (#12316) added usage of llvm.masked.gather for slm_gather(). Such usage does not work with current GPU drivers if ESIMD function is called via invoke_simd() API.
The fix here returns the previous lowering to GenX instead of llvm.masked.gather.
Using the lowering to llvm.masked.gather can be used if define __ESIMD_GATHER_SCATTER_LLVM_IR macro (turned off by default).