[Fix] SameValue: Use Object.is(…) if available

[ExE-Boss]

Object.is(…) simply invokes the SameValue abstract operation.

[ljharb]

This changes SameValue.js from 23 bytes to 366 bytes, a 16x increase. I'm not sure this change is particularly useful here - this function is trivial for engines to inline, and falling back to the builtin one adds unreliability for what i suspect is no performance gain.

If there's actual benchmarks that indicate that the native Object.is method performs significantly faster than this version, then it'd be worth the bundle size increase, but otherwise I think this is probably fine as-is.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.13%. Comparing base (0e7f6df) to head (b2f87e7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   95.39%   92.13%   -3.26%     
==========================================
  Files        2140     2140              
  Lines       31289    31300      +11     
  Branches     7047     7058      +11     
==========================================
- Hits        29847    28838    -1009     
- Misses       1442     2462    +1020     

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