Commits on Sep 22, 2019

1. stage1: fix lost argv[0] …

   - bug presented on FreeBSD when `/proc` filesystem is not mounted
   - bogus `cc` was used as exename, causing incorrect executable spawn
   - llvm::sys::fs::getMainExecutable() has platform-specific code
     to get exename and fallback is to use param argv0
   - linux fallback is rare because `/proc` is usually mounted
   - *BSD fallback is not rare because `/proc` is often not mounted
   - macOS doesn't ever fallback: bug cannot present
   - windows doesn't ever fallback: bug cannot present
   - other Posix will always present

   

   mikdusan committed Sep 22, 2019
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