8294560: assertion raised in newBuiltinSwitchPoint

[szegedi]

Fixes the problem by making switchpoint creation safe under concurrent use.

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Progress

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Issue

• JDK-8294560: assertion raised in newBuiltinSwitchPoint

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/nashorn pull/18/head:pull/18
$ git checkout pull/18

Update a local copy of the PR:
$ git checkout pull/18
$ git pull https://git.openjdk.org/nashorn pull/18/head

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$ git pr checkout 18

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$ git pr show -t 18

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https://git.openjdk.org/nashorn/pull/18.diff

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[szegedi]

/integrate

[openjdk]

@szegedi This pull request has not yet been marked as ready for integration.

[szegedi]

/integrate

[openjdk]

@szegedi This pull request has not yet been marked as ready for integration.