Adding empty IDs to all block types. This is primarily for
TypeBlockId::Empty, which allows me to disambiguate empty tuple types,
which I think might yield a SemIR readability improvement (PR
forthcoming). I'm splitting PRs so that the limited test impact here is
clear.
- Generate runtime indices as part of pattern matching, rather than as a
separate postprocessing/rewriting step.
- In contexts where runtime parameters aren't permitted, avoid emitting
insts for them to begin with, rather than trying to detect the problem
and rewrite the IR to remove them later on.
Also propagate the pattern IR along with the pattern-match IR, and use
it where appropriate.
Strictly speaking, some parts of the pattern-match IR are allocated
eagerly, while traversing the pattern's parse tree, but they still
aren't actually emitted until we traverse the associated pattern insts.
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Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Jon Ross-Perkins
josh11bandJosh L
Geoff RomerandJon Ross-Perkins