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51c3b7c6ec
Fetching the size of a type typically involves a hash table lookup,
and is generally non-trivial. The escape analysis code calls is_big
more than one might expect. So only fetch the size if we need it.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/197699
From-SVN: r276187
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