Normative: ToInteger normalizes -0 to +0 (tc39#1827)

Fixes tc39#1637.

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

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>
@@ -26256,7 +26256,7 @@ <h1>Function.prototype.bind ( _thisArg_, ..._args_ )</h1>
             1. If Type(_targetLen_) is not Number, let _L_ be 0.
             1. Else,
               1. Set _targetLen_ to ! ToInteger(_targetLen_).
-              1. Let _L_ be the larger of 0 and the result of _targetLen_ minus the number of elements of _args_.
+              1. Let _L_ be the larger of *+0* and the result of _targetLen_ minus the number of elements of _args_.
           1. Else, let _L_ be 0.
           1. Perform ! SetFunctionLength(_F_, _L_).
           1. Let _targetName_ be ? Get(_Target_, *"name"*).
@@ -28501,9 +28501,7 @@ <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>