Minify `try-catch-finally` syntax

[dgp1130]

Empty catch {} and finally {} blocks should be removed from the bundle. And a try without any catch or finally blocks should also be removed, with its content inlined.

// Input
try {
  console.log('try');
} catch {
  // empty
} finally {
  // empty
}

// Current output
try {
  console.log('try');
} catch {
} finally {
}

// Expected output
console.log('try');

Playground link

This would be useful for situations where error handlers are removed via a --define or other tree shaking mechanism. I ran into it today while trying to do some debug data tracking backed by a --define. I wanted to write:

declare global {
  var isDebug: boolean | undefined; // Set via `--define`.
}

const data: DebugData[] = [];

function doSomething(callback: () => void): void {
  if (isDebug) data.push(getDebugData());
  try {
    callback();
  } finally {
    if (isDebug) data.pop();
  }
}

But this leaves an otherwise-unnecessary try {} and finally {} syntax in production. I can't remove that finally from source as it is necessary for correctness in debug mode, but I'd rather not ship it to production as it's just wasted bytes.