Fix panic in backtrace symbolication on win7 #808
| Job | Run time |
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| 28s | |
| 49s | |
| 48s | |
| 18s | |
| 2m 12s | |
| 55s | |
| 14s | |
| 45s | |
| 18s | |
| 3m 44s | |
| 41s | |
| 11s | |
| 16s | |
| 43s | |
| 17s | |
| 48s | |
| 1m 59s | |
| 42s | |
| 1m 0s | |
| 1m 57s | |
| 43s | |
| 3m 8s | |
| 41s | |
| 2m 55s | |
| 33s | |
| 4m 59s | |
| 1m 34s | |
| 2m 3s | |
| 1m 20s | |
| 2m 19s | |
| 1m 22s | |
| 2m 46s | |
| 1m 21s | |
| 1m 31s | |
| 46m 20s |