RFR: 8268296: ScopedMemoryAccess build error with readonly filesystems

[Erik Joelsson]

On Sun, 6 Jun 2021 20:09:32 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

> This change fixes a build error during the generation of `ScopedMemoryAccess.java` when the sources are readonly, by using `cat a > b` instead of `cp a b` to avoid propagating the permissions to the generated source.

Looks good.

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Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4380