Cherry pick PR #2730: [XB] Use different size of output pool for different targets #1955

Job	Run time
raspi-2 / initialize	54s
raspi-2-skia / initialize	37s
raspi-2-skia / docker-build-image	26s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	26s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	8m 28s
raspi-2-skia / raspi-2-skia_debug	12m 19s
raspi-2-skia / raspi-2-skia_qa	7m 53s
raspi-2-skia / raspi-2-skia_gold	6m 45s
raspi-2 / raspi_devel	9m 25s
raspi-2 / raspi_debug	12m 11s
raspi-2 / raspi_qa	6m 54s
raspi-2 / raspi_gold	6m 59s
raspi-2 / sbversion-15_devel	9m 29s
raspi-2 / sbversion-15_debug	12m 34s
raspi-2 / sbversion-15_qa	6m 52s
raspi-2 / sbversion-15_gold	7m 45s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / on-host-unit-test-report	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / on-host-unit-test-report	0s
	1h 49m 57s

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