Integrated: 8254793: [JVMCI] improve speculation encoding

[Doug Simon]

On Wed, 14 Oct 2020 22:01:19 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> This PR changes the encoding of a `jdk.vm.ci.hotspot.HotSpotSpeculationLog.HotSpotSpeculation` from a long to an int.
> The `Thread::_pending_failed_speculation` field remains as a `jlong` since it is already exposed to JVMCI Java code
> already via VMStructs and this PR does not update its usage in Graal.

This pull request has now been integrated.

Changeset: f42c0322
Author:    Doug Simon <dnsimon at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/f42c0322
Stats:     70 lines in 9 files changed: 50 ins; 1 del; 19 mod

8254793: [JVMCI] improve speculation encoding

Reviewed-by: kvn, dlong, never

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PR: https://git.openjdk.java.net/jdk/pull/667