Normative: ToInteger normalizes -0 to +0 (#1827)

Fixes #1637.

This only has an observable impact on `Atomics.store`.

Author: ljharb

spec.html

@@ -4801,8 +4801,8 @@ <h1>ToInteger ( _argument_ )</h1>
       <p>The abstract operation ToInteger converts _argument_ to an integral Number value. This abstract operation functions as follows:</p>
       <emu-alg>
         1. Let _number_ be ? ToNumber(_argument_).
-        1. If _number_ is *NaN*, return *+0*.
-        1. If _number_ is *+0*, *-0*, *+&infin;*, or *-&infin;*, return _number_.
+        1. If _number_ is *NaN*, *+0*, or *-0*, return *+0*.
+        1. If _number_ is *+&infin;*, or *-&infin;*, return _number_.
         1. Return the Number value that is the same sign as _number_ and whose magnitude is floor(abs(_number_)).
       </emu-alg>
     </emu-clause>
@@ -28518,9 +28518,7 @@ <h1>TimeClip ( _time_ )</h1>
         <emu-alg>
           1. If _time_ is not finite, return *NaN*.
           1. If abs(_time_) &gt; 8.64 &times; 10<sup>15</sup>, return *NaN*.
-          1. Let _clippedTime_ be ! ToInteger(_time_).
-          1. If _clippedTime_ is *-0*, set _clippedTime_ to *+0*.
-          1. Return _clippedTime_.
+          1. Return ! ToInteger(_time_).
         </emu-alg>
         <emu-note>
           <p>The point of step 4 is that an implementation is permitted a choice of internal representations of time values, for example as a 64-bit signed integer or as a 64-bit floating-point value. Depending on the implementation, this internal representation may or may not distinguish *-0* and *+0*.</p>