Address mficarra review

- Make waitable in ValidateIntegerTypedArray non-optional
- Fix ValidateTypedArray reference in %TA%.p.toLocaleString

spec.html

@@ -41159,7 +41159,7 @@ <h1>%TypedArray%.prototype.subarray ( _begin_, _end_ )</h1>
       <emu-clause id="sec-%typedarray%.prototype.tolocalestring">
         <h1>%TypedArray%.prototype.toLocaleString ( [ _reserved1_ [ , _reserved2_ ] ] )</h1>
         <p>This is a distinct method that implements the same algorithm as `Array.prototype.toLocaleString` as defined in <emu-xref href="#sec-array.prototype.tolocalestring"></emu-xref> except that IntegerIndexedObjectLength is called in place of performing a [[Get]] of *"length"*. The implementation of the algorithm may be optimized with the knowledge that the *this* value has a fixed length when the underlying buffer is not resizable and whose <emu-xref href="#integer-index">integer-indexed</emu-xref> properties are not sparse. However, such optimization must not introduce any observable changes in the specified behaviour of the algorithm.</p>
-        <p>This method is not generic. ValidateTypedArray is applied to the *this* value prior to evaluating the algorithm. If its result is an abrupt completion that exception is thrown instead of evaluating the algorithm.</p>
+        <p>This method is not generic. ValidateTypedArray is called with the *this* value and ~SeqCst~ as arguments prior to evaluating the algorithm. If its result is an abrupt completion that exception is thrown instead of evaluating the algorithm.</p>
         <emu-note>
           <p>If the ECMAScript implementation includes the ECMA-402 Internationalization API this method is based upon the algorithm for `Array.prototype.toLocaleString` that is in the ECMA-402 specification.</p>
         </emu-note>
@@ -44171,13 +44171,12 @@ <h1>Abstract Operations for Atomics</h1>
         <h1>
           ValidateIntegerTypedArray (
             _typedArray_: an ECMAScript language value,
-            optional _waitable_: a Boolean,
+            _waitable_: a Boolean,
           ): either a normal completion containing an Integer-Indexed Object With Buffer Witness Record, or a throw completion
         </h1>
         <dl class="header">
         </dl>
         <emu-alg>
-          1. If _waitable_ is not present, set _waitable_ to *false*.
           1. Let _iieoRecord_ be ? ValidateTypedArray(_typedArray_, ~Unordered~).
           1. NOTE: Bounds checking is not a synchronizing operation when _typedArray_'s backing buffer is a growable SharedArrayBuffer.
           1. If _waitable_ is *true*, then