RFR: 8296496: Overzealous check in sizecalc.h prevents large memory allocation

[Alexander Zuev]

On Tue, 8 Nov 2022 13:54:31 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> To be safe, `a` should also be cast.
>
>And IS_SAFE_STRUCT_SIZE should also be updated to pass (size_t)(m) * (size_t)(n) to IS_SAFE_SIZE_ADD instead of (m) * (n).

Sounds reasonable.

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PR: https://git.openjdk.org/jdk/pull/11030