Commits on Oct 12, 2023

1. Normative: Add resizable ArrayBuffer and growable SharedArrayBuffer (t… …

   …c39#3116)
   
   Major differences from the spec draft:
   
   - The idempotent byte length getter machinery is replaced with
     Integer-Indexed Object With Buffer Witness Record and DataView With
     BufferWitness Record values instead. These records cache the byte
     length ahead of time. Because shared memory events are observable,
     there should only be a single load event of growable SAB byte length
     until the next point where user code may be called.
   
   - IsResizableArrayBuffer is negated and renamed to
     IsFixedLengthArrayBuffer, because it covers both resizable ABs and
     growable SABs.

   

   syg authored and ljharb committed Oct 12, 2023
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