22bda2226b
In watch builds, the compiler attempts to reuse as much information from a prior compilation as possible. To accomplish this, it keeps a reference to the most recently succeeded `TraitCompiler`, which contains all analysis data for the program. However, `TraitCompiler` has an internal reference to an `IncrementalBuild`, which is itself built on top of its prior state. Consequently, all prior compilations continued to be referenced, preventing garbage collection from cleaning up these instances. This commit changes the `AnalyzedIncrementalState` to no longer retain a `TraitCompiler` instance, but only the analysis data it contains. This breaks the retainer path to the prior incremental state, allowing it to be garbage collected. PR Close #42537
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