Prune targets #872

Job	Run time
Generate configs	9s
Smoketests	6m 10s
Lint Bazel files	3s
//sram:top_mix_cts	2m 58s
tag_array_64x184_generate_abstract	3m 36s
tag_array_64x184_report	2m 18s
open //sram:top_mix	3m 5s
Local flow - clean setup	7m 13s
lb_32x128_generate_abstract	3m 42s
open tag_array_64x184	2m 10s
lb_32x128_test_generate_abstract	2m 16s
open L1MetadataArray	4m 8s
L1MetadataArray_generate_abstract	4m 59s
open subpackage:L1MetadataArray	4m 12s
data_2048x8_generate_abstract	2m 14s
open subpackage:tag_array_64x184	2m 8s
regfile_128x65_floorplan	2m 12s
subpackage:L1MetadataArray_generate_abstract	4m 54s
subpackage:tag_array_64x184_generate_abstract	1m 59s
Local flow - preinstalled orfs	7m 19s
	1h 7m 45s

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