Add the try_demangle function
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The `try_demangle` function is the same as `demangle`, except it returns an `Err` if the string does not appear to be a Rust symbol, rather than "demangling" the given string as a no-op.
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The
try_demanglefunction is the same asdemangle, except it returns anErrifthe string does not appear to be a Rust symbol, rather than "demangling" the
given string as a no-op.
r? @alexcrichton
Blocks rust-lang/backtrace-rs#31