Code gen: improve pattern matching of optional fields. #7143
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Pattern matching of optional fields such as ```res | {x: 1, y: "hello"} ``` can be specialised as the constants already imply the values cannot be absent. 
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⚠️ Performance Alert ⚠️
Possible performance regression was detected for benchmark 'Syntax Benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.05.
| Benchmark suite | Current: e982516 | Previous: e1b7fb7 | Ratio |
|---|---|---|---|
Print RedBlackTreeNoComments.res - time/run | 2.21412674 ms | 2.10057036 ms | 1.05 |
This comment was automatically generated by workflow using github-action-benchmark.
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Pattern matching of optional fields such as
| {x: 1, y: "hello"}can be specialised as the constants already imply the values cannot be absent.