[SYCL] vec<bfloat16> optimization fix (#12794) #241

Job	Run time
macOS / Build	16m 50s
Linux (Self build + shared libraries + no-assertions) / Build + LIT	12m 34s
build-win / Build + LIT	48m 16s
e2e-lin (Intel Arc A-Series Graphics with Level Zero, ["Linux", "arc"], --param matrix-xmx8=True ... / Intel Arc A-Series Graphics with Level Zero	15m 35s
e2e-lin (Perf tests on Intel Arc A-Series Graphics system, ["Linux", "arc"], {"LIT_FILTER":"Perfo... / Perf tests on Intel Arc A-Series Graphics system	1m 4s
e2e-lin (Perf tests on Intel GEN12 Graphics system, ["Linux", "gen12"], {"LIT_FILTER":"Performanc... / Perf tests on Intel GEN12 Graphics system	1m 13s
e2e-lin (Intel GEN12 Graphics with Level Zero, ["Linux", "gen12"], --param gpu-intel-gen12=True, ... / Intel GEN12 Graphics with Level Zero	48m 11s
e2e-win / Intel GEN12 Graphics with Level Zero	2m 33s
	2h 26m 16s

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