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a792bf1703
Previously when a file was being analyzed to determine if a shim should be generated, up to two calls to the host `fileExists` function per file per generator were made. In the default host, each `fileExists` call made two underlying file system calls. Following these calls, the file was then read via `getSourceFile`. However, `getSourceFile` will return `undefined` if the requested file does not exist. As a result, `getSourceFile` can be used directly to request both potential file names and leverage the return value to determine if the file does not exist. This avoids the need to call `fileExists` at all. PR Close #47682