Update the operator precedence to achieve a few goals:
- Form operators into groups which behave similarly
- Make the group of operators ("top-level operators") that capture
everything to the right, like `if`...`then`...`else`, behave similarly
to the left, so that rearranging expressions won't change how they
group.
- Add the `where` operator, used to specify constraints on facet types,
to the precedence chart, to define how it interacts with other
operators.
- Make the operator precedence diagram prettier, so that it eventually
can be made into a poster that Carbon programmers can hang on their
walls.
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Co-authored-by: Josh L <josh11b@users.noreply.github.com>
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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