enable multi-process compilation with clang on windows #1423
| Job | Run time |
|---|---|
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| 11m 7s | |
| 13m 3s | |
| 10m 16s | |
| 16m 31s | |
| 12m 16s | |
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| 13m 48s | |
| 10m 5s | |
| 15m 26s | |
| 13m 9s | |
| 13m 37s | |
| 18m 34s | |
| 13m 34s | |
| 5m 13s | |
| 12m 31s | |
| 6m 33s | |
| 17m 5s | |
| 8m 58s | |
| 12m 28s | |
| 11m 38s | |
| 10m 52s | |
| 7m 29s | |
| 5h 36m 26s |