[SYCL][Doc] Add specialization constant-length alloca extension propo… #237

Job	Run time
macOS / Build	9m 57s
Linux (Self build + shared libraries + no-assertions) / Build + LIT	2m 18s
build-win / Build + LIT	39m 5s
e2e-lin	0s
e2e-win / Intel GEN12 Graphics with Level Zero	2m 39s
	53m 59s

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