RFR: 8284584: Avoid duplicate node_idx_t definitions [v2]

[Aleksey Shipilev]

On Fri, 8 Apr 2022 17:04:31 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> I am not sure we want to move C2's specific type to general code. `node.hpp` includes `compile.hpp` so may be leave definition there only.

`compile.hpp` looks like a dumping ground for everything global to C2, right? If so, it indeed makes sense to leave the only definition there. Please see new commit.

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PR: https://git.openjdk.java.net/jdk/pull/8164