Reverts r187449 (report_fatal_error) in favor of a log message since
the extra check introduces 22 new test failures with the LLDB clang buildbot.

Note that the unhandled DWARF_OP codes in DWARFExpression::Evaluate don't cause test failures if the check is ignored.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187480 91177308-0d34-0410-b5e6-96231b3b80d8