Fuse adjacent JOIN_GENERATORS with same path condition

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Instant Renderenhancementhelp wantedlevel 2 (easy)

仓库指标

This...

let x = __abstract("boolean", "(x)");
if (x) console.log("Hello");
if (x) console.log(" World");

currently prepacks to

(function () {
  var _0 = x;

  if (_0) {
    console.log("Hello");
  }

  if (_0) {
    console.log(" World");
  }
})();

but should Prepack to

(function () {
  var _0 = x;

  if (_0) {
    console.log("Hello");
    console.log(" World");
  }
})();

(Seen arising from actual product code.)