Unbreak build_size_test.sh (-Wvla-cxx-extension) on my local machine

[swolchok]

I guess our CI compiler doesn't have this warning, but it's triggering for me locally. The warning is fundamentally correct, so I just fixed it.

[swolchok]

Stack from ghstack (oldest at bottom):

• outline input validation in elementwise_util #12031
• Specialize BroadcastIndexesRange for the case where there is only 1 contiguous input #12023
• Build size_test binaries with debug info #12019
• Detect release builds by comparing CMAKE_BUILD_TYPE to Debug, not Release #12045
• Show output of the size command in size test scripts #12018
• -> Unbreak build_size_test.sh (-Wvla-cxx-extension) on my local machine #12017

[pytorch-bot]

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[kimishpatel]

looks good to me