fast-get: Fix shared data usage by multiple callers #259

Job	Run time
manifest-check	2m 44s
LP64-WIP	3m 43s
build-windows (mtl lnl)	12m 40s
build-windows (-d, lnl)	10m 30s
build-windows (tgl tgl-h)	12m 1s
build-linux (mnfst, mtl lnl)	6m 43s
build-linux (mnfst, ptl)	5m 40s
build-windows (imx8 imx8x imx8m imx8ulp)	15m 18s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 50s
build-windows (ptl)	12m 21s
build-linux (zmain, tgl tgl-h)	5m 20s
build-linux (mnfst, wcl imx95)	6m 59s
build-linux (zmain, ptl)	5m 30s
build-linux (mnfst, tgl tgl-h)	5m 18s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 48s
build-linux (-d, mnfst, lnl)	4m 23s
build-linux (zmain, mtl lnl)	5m 49s
compare-linux-win	28s
	2h 9m 5s

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