llvm dev - Apr 2021 - TableGen !find operator

I've implemented the !find operator for TableGen.

    !find(source_string, target_string [, start-pos])

It returns the position of the target_string in the source_string. The 
question is: What should it return if the there is no match?

std::string::find() returns npos, which is ~size_t 
<https://llvm.org/doxygen/classsize__t.html>(0). TableGen's integers
are
signed. So it could return -1, or it could return the maximum positive 
signed integer. Or, it could break with tradition and return the length 
of the source_string. The easiest thing to test for is -1.

Opinions, please.

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