[xla] ShapeUtil: optimize shape traversal #97381
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``` name cpu/op cpu/op vs base BM_ShapeCount/0/0 4.556n ± 1% 4.545n ± 1% ~ (p=0.365 n=20) BM_ShapeCount/2/8 245.0n ± 1% 182.5n ± 0% -25.51% (p=0.000 n=20) BM_ShapeCount/4/8 23.54µ ± 10% 14.10µ ± 2% -40.11% (p=0.000 n=20) BM_ShapeCount/1/1000 2.947µ ± 1% 2.285µ ± 1% -22.45% (p=0.000 n=20) geomean 527.5n 404.3n -23.36% name time/op time/op vs base BM_ShapeCount/0/0 4.566n ± 0% 4.554n ± 1% ~ (p=0.365 n=20) BM_ShapeCount/2/8 245.5n ± 1% 183.0n ± 0% -25.48% (p=0.000 n=20) BM_ShapeCount/4/8 23.61µ ± 10% 14.14µ ± 1% -40.11% (p=0.000 n=20) BM_ShapeCount/1/1000 2.954µ ± 1% 2.291µ ± 0% -22.46% (p=0.000 n=20) geomean 528.8n 405.3n -23.35% ``` PiperOrigin-RevId: 786142617
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[xla] ShapeUtil: optimize shape traversal