rustc: Support auto-retry linking on a segfault
This is a last-ditch attempt to help our pain with dealing with #38878 on the bots. A new environment variable is added to the compiler, `RUSTC_RETRY_LINKER_ON_SEGFAULT`, which will instruct the compiler to automatically retry the final linker invocation if it looks like the linker segfaulted (up to 2 extra times). Unfortunately there have been no successful attempts to debug #38878. The only information seems to be that the linker (e.g. `ld` on OSX) is segfaulting somewhere in some thread pool implementation. This appears to be spurious as failed PRs will later merge. The hope is that this helps the queue keep moving without clogging and delaying PRs due to #38878.
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