8382166: [AOT Cache] CRC was not checked on Code Region

[Delawen]

Fixes: https://bugs.openjdk.org/browse/JDK-8382166

While other regions check the CRC when loading the cache[1], the code cache region does not check it[2].

This may bring issues with corrupted (or tainted) caches that load corrupted (or malicious) code into memory.

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/cds/filemap.cpp#L1319-L1323 or https://github.com/openjdk/jdk/blob/master/src/hotspot/share/cds/filemap.cpp#L1285-L1286
[2] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/cds/filemap.cpp#L1338-L1372

On this PR, we add a CRC check that cleans up memory if it fails. The code is inspired on https://github.com/openjdk/jdk/blob/master/src/hotspot/share/cds/filemap.cpp#L1319-L1323

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Issue

• JDK-8382166: [AOT Cache] CRC was not checked on Code Region (Bug - P4)

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