Cranelift: dedupe trap[n]z instructions
#10004
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fitzgen
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This commit extends our existing support for merging idempotently side-effectful instructions that produce exactly one value to those that produce zero or one value, and marks the `trap[n]z` instructions as having idempotent side effects. This cleans up a lot test cases in our `disas` test suite, particularly those related to explicit bounds checks and GC. As an aside, it seems like it should be easy to extend this to idempotently side-effectful instructions that produce multiple values as well, but I don't believe we have any such instructions, so I didn't bother.
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This commit extends our existing support for merging idempotently side-effectful instructions that produce exactly one value to those that produce zero or one value, and marks the
trap[n]zinstructions as having idempotent side effects. This cleans up a lot test cases in ourdisastest suite, particularly those related to explicit bounds checks and GC.As an aside, it seems like it should be easy to extend this to idempotently side-effectful instructions that produce multiple values as well, but I don't believe we have any such instructions, so I didn't bother.