[xla] Optimize ShapeUtil::ForEach traverals #28987
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``` name cpu/op cpu/op vs base BM_ShapeCount/0/0 4.886n ± 0% 4.902n ± 1% ~ (p=0.365 n=20) BM_ShapeCount/2/8 377.9n ± 1% 249.2n ± 1% -34.07% (p=0.000 n=20) BM_ShapeCount/4/8 28.96µ ± 2% 23.39µ ± 4% -19.22% (p=0.000 n=20) BM_ShapeCount/1/1000 4.971µ ± 1% 2.950µ ± 1% -40.65% (p=0.000 n=20) geomean 718.1n 538.8n -24.96% ``` PiperOrigin-RevId: 784002328
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[xla] Optimize ShapeUtil::ForEach traverals