mark `Math.sumPrecise` as shipped in Safari 26.2 #1214

Job	Run time
list-branches	8s
Build for master	47s
Build for proposals-types	9s
Build for data-view-clamped-stage-2	7s
Build for v3	12s
Build for v4	6s
Build for web	10s
Build for v4-types	7s
combine-pages-and-deploy	15s
	2m 1s

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