Jordan Rose c1e4be1ad2 Catch llvm::report_fatal_error and try to emit a proper diagnostic. (#8639) ...

This only affects the textual output, but should still improve the
experience when we /do/ hit one of these LLVM errors. In addition to
showing up better in Xcode, it'll also give us a proper
PrettyStackTrace because of the call to abort() instead of exit(1).

(There's a bit of finger-crossing that the act of printing the
diagnostic doesn't cause more errors. I only tested the fallback
path a little.)

2017-04-10 10:40:03 -07:00

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