8382481: GenShen: Compilation failure using GCC 14

[earthling-amzn]

GCC 14's deeper inlining optimizations interact badly with stringop-overflow here. It falsely detects that the region pointer could be null. Simplest fix is to just add a nullptr check for it. Alternatively, should we consider disabling this warning? The Linux kernel has: https://www.phoronix.com/news/Linux-Drop-GCC--Wstringop-of.

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Issue

• JDK-8382481: GenShen: Compilation failure using GCC 14 (Bug - P4)

Reviewers

• Xiaolong Peng (@pengxiaolong - Committer)

Reviewing

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Webrevs

• 00: Full (a20624cf)

[pengxiaolong]

We also noticed this error in Jenkins pipeline, but with GCC13.

[earthling-amzn]

Closing without integrating in favor of #30784