8390874: MethodData::extra_data_lock memory leak

[synecdoche]

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Issue

• JDK-8390874: MethodData::extra_data_lock memory leak (Bug - P2)

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[shipilev]

The test is obviously too slow, GHA times out everywhere. A better version:
TestMethodDataObjectMutexLeak.java. Bugs out at epoch 6-7 when bug is present. Passes in <20s in both fastdebug and release when bug is fixed.

[mlbridge]

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• 00: Full (d3014c8d)

[synecdoche]

The test is obviously too slow, GHA times out everywhere. A better version: TestMethodDataObjectMutexLeak.java. Bugs out at epoch 6-7 when bug is present. Passes in <20s in both fastdebug and release when bug is fixed.

Right, of course! More methods, more leaks.