f0688b4d18
ngcc creates typically two `ts.Program` instances for each entry-point, one for processing sources and another one for processing the typings. The creation of these programs is somewhat expensive, as it concerns module resolution and parsing of source files. This commit implements several layers of caching to optimize the creation of programs: 1. A shared module resolution cache across all entry-points within a single invocation of ngcc. Both the sources and typings program benefit from this cache. 2. Sharing the parsed `ts.SourceFile` for a single entry-point between the sources and typings program. 3. Sharing parsed `ts.SourceFile`s of TypeScript's default libraries across all entry-points within a single invocation. Some of these default library typings are large and therefore expensive to parse, so sharing the parsed source files across all entry-points offers a significant performance improvement. Using a bare CLI app created using `ng new` + `ng add @angular/material`, the above changes offer a 3-4x improvement in ngcc's processing time when running synchronously and ~2x improvement for asynchronous runs. PR Close #38840
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