message: fix(compiler-cli): use the oldProgram option in watch mode
  The performCompilation() is always called with an undefined oldProgram option (even in watch mode).
  This was regression introduced in:
  Partial fix, discovered in:
  PR Close
diff: @@ -200,7 +200,7 @@ export function performWatchCompilation(host: PerformWatchHost):
  rootNames: cachedOptions.rootNames,
  options: cachedOptions.options,
  host: cachedCompilerHost,
  - oldProgram: cachedProgram,
  + oldProgram: oldProgram,
  emitCallback: host.createEmitCallback(cachedOptions.options)
  });
  