buffer: remove MAX_SAFE_INTEGER check on length

MAX_SAFE_INTEGER is millions of times larger than the largest buffer
allowed in Node.js. There is no need to squash the length down to
MAX_SAFE_INTEGER. Removing that check results in a small but
statistically significant increase for Buffer.from() operating on
ArrayBuffers in some situations.

PR-URL: #14131
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

lib/buffer.js

@@ -353,8 +353,6 @@ function fromArrayBuffer(obj, byteOffset, length) {
  if (length !== length) {
  length = 0;
  } else if (length > 0) {
- length = (length < Number.MAX_SAFE_INTEGER ?
- length : Number.MAX_SAFE_INTEGER);
  if (length > maxLength)
  throw new RangeError("'length' is out of bounds");
  } else {