Peter Wilson 37d01e0346 Media: Pass the appropriate reference into wp_getimagesize.
With changes that were introduced in #49889 the second parameter for getimagesize() function is expecting a a reference.

Previously, most calls did not pass the 2nd param, and as a result, we are getting unexpected results.

This was only a problem with applications that are using a custom stream wrapper, and the image contained EXIF data.

For more see:

    https://github.com/humanmade/S3-Uploads/issues/496
    https://github.com/aws/aws-sdk-php/issues/1923 

Fixes #52826.
Merges [50552] to the 5.7 branch.
Props terriann, SergeyBiryukov, Mista-Flo, hellofromTonya, rinatkhaziev, whyisjake.

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