This adds a token for a forward slash to the token definition list and
the methods to `AsmParser::parseSlash()` and
`AsmParser::parseOptionalSlash()`, similar to other tokens used as
operators (e.g., star, plus, etc.). This allows implementations of
attributes that contain arithmetic expressions to support operators with
a forward slash, e.g., a division.
The newly added check tests trigger the parsing of a slash in an
attribute.
The current Parser library is solely focused on providing API for
the textual MLIR format, but MLIR will soon also provide a binary
format. This commit renames the current Parser library to AsmParser to
better correspond to what the library is actually intended for. A new
Parser library is added which will act as a unified parser interface
between both text and binary formats. Most parser clients are
unaffected, given that the unified interface is essentially the same as
the current interface. Only clients that rely on utilizing the
AsmParserState, or those that want to parse Attributes/Types need to be
updated to point to the AsmParser library.
Differential Revision: https://reviews.llvm.org/D129605
