[lld] r187670 - Use report_fatal_error() instead of llvm_unreachable() to show broken input file error.

[Richard]

In article <BB5668CC-919A-406F-8531-E9B21E16E7C2 at apple.com>,
    Nick Kledzik <kledzik at apple.com> writes:

> I have similar issues with the darwin linker.  In lots of places I have
> asserts which are really checking object file content issues.  Users of the
> linker freak out when a malformed object file causes the linker to
> crash/assert.  It would be much better if the parsing code returned an
> error up the call chain so that the driver could  print out the path to the
> malformed object file.

Is there any reason we aren't using exceptions instead of error codes
here?
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