Add pending spec for over-escaped multibyte source
Add pending spec for over-escaped multibyte source

Some customers have code with escaped multibyte characters in regular
expressions. This causes the engine to error because File.read
doubly-escapes it, which fails to parse.

The escaping these customers have is not needed. They can remove their
backslash and all should work fine. That's what we're prescribing for
now via customer services, since all other options are too
time-consuming.

Eventually, we would like to support this code as-is (as we do any
realistic source files customers may have) -- when/if we do, this spec
will pass.

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